英文原文英语原文Sand mixerAbstract:A foundry sand mixer for mixing and dispensing silica or green sand and their additives through the enclosed longitudinal belt conveyor mechanism having a plurality of openings in the top communicating with a first feeder disposed above the enclosed longitudinal belt conveyor mechanism and including a pair of openings in the bottom. The first feeder includes an auger-type conveyor and a sand weir communicating with the most upstream opening in the first feeder. A first hopper for containing silica sand and a second hopper for containing green sand are disposed over the first feeder. A selective valve is disposed at the bottom of each of the first and second hoppers permitting the flow of sand through only one of the hoppers at any time or preventing the flow of any sand from the hoppers. The mixer may include additional feeders, some of which are disposed above and downstream from the first feeder, and others including pumps are connected to a plurality of fluids that are fed through a constant speed mixer where the materials are mixed and the mixed materials delivered at a discharge opening. Inventors:Frankie, Donald M. (1599 Gull La., Mound, MN, 55364)Claims: 1. In a foundry sand mixer for mixing and dispensing silica or green sand and their additives, the combination comprising: (a) a support frame pivotal about a vertical axis and having a platform extending radially therefrom; (b) an enclosure including an enclosed longitudinal belt conveyor mechanism extending above said platform and having a plurality of openings in the top of the enclosure communicating with said belt conveyor mechanism; (c) first feeder means disposed above and at the most upstream location of said enclosed longitudinal belt conveyor mechanism, said first feeder means having a bottom and converging sloping sides communicating near the bottom with an auger-type conveyor, and having a pair of openings longitudinally separated in the bottom thereof feeding said belt conveyor;(d) a sand weir communicating with the most upstream opening of said pair of openings in said first feeder means, said sand weir disposed above said longitudinal belt conveyor mechanism for dispersing sand on said belt conveyor mechanism; (e) a first hopper for containing silica sand disposed over the upstream portion of said first feeder means;(f) a second hopper for containing green sand disposed downstream from said first hopper and over said first feeder means; (g) selective valve means disposed at the bottom of each of said first and second hoppers permitting the flow of sand through only one of said hoppers at any time or preventing the flow of any sand from said hoppers; (h) and control means operably connected to said selective valve means for selecting one of said two sands or neither to be dispensed onto said belt conveyor.2. The structure set forth in claim 1 including: (i) a plurality of second feeder means disposed above said belt conveyor mechanism and at a downstream location from said first feeder means, each of said plurality of second feeder means having a bottom and converging sloping sides communicating near the bottom with an auger-type conveyor and having an opening in the bottom thereof feeding said belt conveyor; (j) a constant speed mixer disposed on said platform and arranged to receive granular and liquid materials, mix the materials and deliver the mixed materials at a discharge opening, said belt conveyor communicating with said mixer; (k) and a plurality of pump means connected to a plurality of fluids and communicating with said mixer.Description: This invention relates to the field of mixers and more particularly to the field of foundry sand mixers for mixing silica or green sand and their additives. BACKGROUND OF THE INVENTION While the art of mixing foundry sand per se through a mechanical process is generally known, there are attendant problems in attempting to use the same equipment for mixing green sand and its additives as generally might be used in a mixer using silica sand and its additives. Because of the inherent differences in the materials to be mixed and passed through the machine, the practice has generally been to use separate machines for each of the different foundry sand materials and processes. SUMMARY OF THE INVENTION The embodiments of this improvement invention makes it possible to combine the necessary equipment into a single machine to mix either green sand or silica sand and their additives. Various means have been attempted to mix green sand which requires the addition of such other granular and dry ingredients as fire clay, bentonite, sea coal, pitch, wood flour and the like, along with an appropriate mixture of water. On the other hand, silica sand, which may also be known as a no-bake sand, is generally mixed with dry granular materials such as chromite and ferric oxide and several liquid ingredients which may include certai