Vacuum filter belt apparatus
AssigneeEsmil B.V.
InventorEmilio Gallottini
Life of this patent
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Abstract
Vacuum filter belt apparatus has a continuous belt with an upper run at which suction filtering occurs, via passages which pass through a central thicker portion of the belt and open into a vacuum chamber. To avoid high frictional contact between the belt and the upper side of the vacuum chamber, the thick central portion of the belt passes right through the vacuum chamber from above to below and is supported below the chamber e.g. by rollers or a pressurized chamber.
Claims9
In a vacuum filter belt apparatus comprising a continuous belt movable by driving means along a continuous path which includes an operative path portion at which the upper face of the belt is concave, the belt having a relatively thick central portion which is sealed to at least one vacuum chamber located below the belt at said operative path portion and having a slot in its upper side, there being passages extending from the upper surface of the belt through the relatively thick central portion of the belt to within the vacuum chamber to communicate the upper surface of the belt with the vacuum chamber, whereby suction filtering of material on the belt is effected, the improvement that the vacuum chamber has a slot in its lower side beneath said slot in its upper side and that the said thick central portion of the belt extends through both said slots to beneath the vacuum chamber, there being seals provided at both said slots to seal the vacuum chamber and there being support means for the said thick central portion beneath the vacuum chamber.
Vacuum filter belt apparatus comprising
- a continuous belt of resilient material having, at one side, a concave face,
- belt guide means and drive means for moving the belt in a continuous path including an operative path portion at which said concave face of the belt is facing upwards,
- at least one vacuum chamber located beneath said operative path portion and having a first slot in its upper side and a second slot in its lower side beneath said first slot, both slots extending longitudinally in the direction of travel of the belt in said operative path portion,
- a relatively thick central portion of said belt extending downwardly through both said first and second slots at said operative path portion and being sealed to the vacuum chamber at both said slots,
- a plurality of passages extending through said thick central portion of the belt from the said concave surface of the belt and opening into the vacuum chamber at said operative path portion whereby suction is applied at said concave surface,
- and support means for said thick central portion of the belt beneath said second slot of the vacuum chamber.
Dependencies are inferred from the claim text.