Skimming blade
阅读：237发布：2021-01-07
专利汇可以提供Skimming blade专利检索，专利查询，专利分析的服务。并且This invention relates to a skimming blade for use in a liquid clarification tank which has a plurality of longitudinally extending weir boxes that define the outlet for receiving clarifying liquid. The skimming blade is supported on a bridge that is reciprocated above the tank along a path parallel to the direction of flow of liquid within the tank and has cutouts extending from the lower edge with the cutouts having bases located above the lower edge of the blade. The skimming blade is maintained in a first skimming position where the bases of the cutouts are above the liquid level while the bridge is traversing the box area of the tank and a second skimming position where the bases of the cutouts and the lower edge of the blade are located below the liquid level.，下面是Skimming blade专利的具体信息内容。
1. In a liquid clarification apparatus including a tank having an inlet for supplying fluid with entrained solids and an outlet for receiving clarified liquid, said outlet including a plurality of transversely spaced longitudinally extending weir boxes, each having a bottom wall and side walls, said side walls having upper edges defining the liquid level for said tank; a traveling bridge above said tank; drive means for reciprocating said bridge between extreme positions parallel to said longitudinally extending weirs; and skimming means depEnding from said bridge for removing scum from the surface of said liquid, said skimming means including an elongated blade extending transversely of said tank, said blade having cutouts aligned with said weir boxes in the direction of travel of said bridge, and said cutouts having bases located above the lower edge of said blade and below the upper edge of said blade; and means maintaining said blade in a first skimming position while said bridge is moving in the area of said weir boxes, a second skimming position below said first skimming position while said blade is in the area of the tank between said inlet and said weir boxes and an inoperative position where said blade is located above said upper edges when said bridge is traveling in an opposite direction, said bases of said cutouts being located above said upper edges in said first skimming position and below said upper edges in said second skimming position while said lower edge of said blade is located below said upper edges in both skimming positions.
2. Liquid clarification apparatus as defined in claim 1, further including baffles surrounding said weir boxes with said baffles extending above and below said upper edges of said weir boxes, and in which said means maintaining said blade in said first skimming position includes surfaces on said baffles for engaging the bases of said cutouts to maintain said blade in said first skimming position when the blade is in the weir box area of the tank.
3. Liquid clarification apparatus as defined in claim 2, in which said baffles have horizontal flanges on the upper edges thereof, said horizontal flanges defining said surfaces for engaging the bases of said cutouts to support said blade in the first skimming position while the blade is moving the weir box area of the tank toward the outlet end.
4. Liquid clarification apparatus as defined in claim 1, in which said blade has V-shaped surfaces between adjacent cutouts with the apex of each V-shaped surface on the trailing side of said blade while the blade is in the first and second skimming positions.
5. Liquid clarification apparatus as defined in claim 1, in which said means maintaining said blade includes pivot means supporting said blade for pivotal movement between said second skimming position and said inoperative position, cable means on said bridge and connected to said blade for moving said blade between said second skimming position and said inoperative position, and cam means adjacent said weir boxes for maintaining said blade in the first skimming position while said blade is in the weir box area of the tank, said cam means accommodating movement of said blade to the second skimming position when said blade leaves the weir box area of the tank.
6. Liquid clarification apparatus as defined in claim 5, including baffles surrounding each of said weir boxes with said cam means located on the upper edges of said baffles, said cam means engaging the bases of said cutouts.
7. Liquid clarification apparatus as defined in claim 6, in which said cam means each include a horizontal portion maintaining said blade in the first skimming position and an inclined portion accommodating movement of the blade from the first to the second skimming position.
8. Liquid clarification apparatus comprising a tank having an inlet for supplying liquid having entrained solids and an outlet for receiving clarified liquid, said outlet including a plurality of transversely spaced longitudinally extending weir boxes in said tank for receiving said clarified liquid, said weir boxes each having a bottom wall and side walls with upper edges of said side walls defining the liquid level in said tank; scum baffles surrounding each weir box, said scum baffles having upper and lower edges respectively located above and below said upper edges; a traveling bridge supported on said tank; drive means for reciprocating said bridge between extreme positions parallel to said longitudinally extending weir boxes and said baffles; and sKimming means supported on said bridge and extending transversely of said tank for removing scum from the surface of the liquid, said skimming means including an elongated blade having cutouts extending from the lower edge, said cutouts having bases located above said lower edge and being aligned with said baffles, and means maintaining said blade in a first skimming position wherein the bases of said cutouts are above said upper edges of said side walls while said bridge is traversing the weir box area of said tank in one direction and a second skimming position wherein the bases of said cutouts are below said upper edges of said side walls while the bridge is traveling in the area of the tank between the weir boxes and the inlet in said one direction.
9. Liquid clarification apparatus as defined in claim 8, in which said means maintaining said blade includes cam means in the weir box area of the tank supporting said blade in the first skimming position.
10. Liquid clarification apparatus as defined in claim 9, in which said means maintaining said blade includes pivot means supporting said blade in the second skimming position, said pivot means supporting said blade in an inoperative position while said bridge is moving in the opposite direction.
11. Skimming means for use in a tank having an inlet and an outlet with transversely spaced, longitudinally extending weir boxes between said outlet and said inlet comprising an elongated blade having opposite ends and opposite edges, one of said edges having spaced cutouts that are substantially rectangular, said cutouts having bases that extend substantially parallel to said one edge, said blade being V-shaped in plan view between each pair of adjacent cutouts so that said blade can skim the surface of a liquid in the tank by having said one edge located below the surface of the liquid in the area of the tank having the weir boxes while the bases of the cutouts are located above the weir boxes.
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