Separator screen and screening method

A - Human Necessities – 22 – C

Patent

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Details

A22C 7/00 (2006.01) A22C 17/04 (2006.01) B02C 23/16 (2006.01)

Patent

CA 2236308

A screen (12) for use in a separator device (10) includes an inner portion (22) opening onto the screen inner surface (24) and an outer portion (26) extending the re- mainder of the way through the screen material. The outer portion (26) of the screen opening (20) al- lows the desired material to pass therethrough, while blocking the entry of large pieces of hard ma- terial. The inner portion (22) of the screen opening (20) includes a deflecting surface (40) forming an acute deflecting angle (B) with the inner screen surface (24) in the direction at which a cutting ele- ment passes over the screen open- ing (20). Large pieces of hard material that may partially enter the screen opening (20) are pressed against the deflecting surface (40) as the cutting element passes over the screen opening (20), the deflect- ing surface (40) serving to deflect the hard material out of the screen opening (20) without chipping off or cutting off any of the hard mate- rial, which could then pass through the screen opening (20) along with the desired material.

La présente invention concerne un tamis (12), destiné à un appareil séparateur (10) et comprenant une partie intérieure (22) qui s'ouvre sur la surface intérieure (24) du tamis et une partie extérieure (26) qui s'étend sur le reste du passage à travers la matière du tamis. La partie extérieure (26) de l'ouverture (20) du tamis permet aux matières désirées de passer à travers, tout en bloquant le passage pour les gros morceaux de matière dure. La partie intérieure (22) de l'ouverture (20) du tamis comprend une surface déflectrice (40) qui forme un angle de déflexion aigu (B) avec la surface intérieure (24) du tamis, dans la direction dans laquelle un élément coupant passe sur l'ouverture (20) du tamis. Les gros morceaux de matière dure qui peuvent avoir partiellement pénétré dans l'ouverture (20) du tamis sont comprimés contre la surface déflectrice (40) lorsque l'élément coupant passe sur l'ouverture (20) du tamis. La surface déflectrice (40) sert à dévier les matières dures hors de l'ouverture (20) du tamis, sans arracher ni couper de ces matières aucune parcelle qui pourrait ensuite passer par l'ouverture (20) du tamis en même temps que les matières désirées.

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