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1. 发明授权

US4709862A Method of reclaiming green sand 失效
标题翻译：回收绿砂的方法
公开(公告)号：US4709862A
公开(公告)日：1987-12-01
申请号：US8748
申请日：1987-01-30
申请人： Dieter S. Leidel
发明人： Dieter S. Leidel
IPC分类号： B22C5/18 , B02C19/12
CPC分类号： B22C5/18 , Y10S241/10
摘要： A method for reclaiming green sands having a wide range of moisture and temperature conditions involves processing such sands in a single reclaimer unit to produce free flowing reclaimed sand adapted to pass through a 20 mesh screen and having a temperature preferably no greater than about 120.degree. F. The method involves effecting attrition of a batch of molding sand supplied to the reclaimer unit, applying a vacuum exhaust to the unit primarily to remove a calcined clay binder and water vapor therefrom, sensing the means temperature of the sand, and selectively adding moisture or heat to the sand as required to produce reclaimed sand having predetermined moisture and temperature conditions allowing such sand to be immediately screened of extraneous materials and passed to a mulling device or remixer. The rate of addition of moisture, if any, and the flow of exhaust air through the unit are controlled in order to prevent condensation in the exhaust conduit and dust collection devices.
摘要翻译：用于回收具有广泛的水分和温度条件的绿砂的方法包括在单个回收单元中处理这种砂，以产生适于通过20目筛并具有优选不大于约120°F的温度的自由流动的再生砂该方法包括对一批供给到回收单元的型砂进行磨损，向该单元施加真空排气以主要从其中去除煅烧粘土粘合剂和水蒸气，感测砂的平均温度，并选择性地加入水分或根据需要对沙子进行加热，以产生具有预定水分和温度条件的再生砂，以允许这种沙子立即筛分出外来材料并传递至研磨装置或再混合器。为了防止排气管道和集尘装置中的冷凝，控制加入湿气的速度（如果有的话）和排出空气通过该单元的流量。

2. 发明授权

US4681267A Method of regenerating old casting sand 失效
标题翻译：再生旧铸砂的方法
公开(公告)号：US4681267A
公开(公告)日：1987-07-21
申请号：US720129
申请日：1985-04-05
申请人： Dieter S. Leidel , Hubert Eirich , Paul Eirich , Walter Eirich
发明人： Dieter S. Leidel , Hubert Eirich , Paul Eirich , Walter Eirich
IPC分类号： B22C5/00 , B22C5/04 , B22C5/08 , B02C19/18
CPC分类号： B22C5/08 , Y10S241/10
摘要： A method of regenerating old casting sand consists of the steps of introducing essentially dry, used casting sand into a single container, then simultaneously subjecting the sand to rapid heating and extreme turbulence by directing a gas flame against the sand having a temperature of at least 1400.degree. C. (2550.degree. F.) along a first axis, rotating a crushing tool about a second axis parallel to the first axis and positioned such that the crushing tool does not pass through the gas flame and rotating the container about a third axis, parallel to the first and second axes. In a preferred embodiment, the container is cylindrical in shape and the third axis is inclined from the vertical at an angle of between 10.degree. and 60.degree., thereby creating upper and lower zones. The burner flame preferably is directed to the sand in the lower zone and the crushing tool is positioned to operate in the upper zone. By simultaneously contacting the oil sand with a source of intense heat and subjecting the sand to violent agitation, the binder encasing the grains of sand is rapidly embrittled and the old sand particles are subjected to thermal shock in which the boundary faces between the binder and the sand grains are subjected to stress, thereby accelerating the disintegration of the binder and its removal from the individual sand grains.
摘要翻译：再生旧铸砂的方法包括以下步骤：将基本上干燥的使用的铸砂引入单个容器中，然后通过将气体火焰引导到具有至少1400℃的温度的砂上来同时使砂快速加热和极度湍流（2550°F）沿着第一轴线旋转，使破碎工具围绕平行于第一轴线的第二轴线旋转并且定位成使得破碎工具不穿过气体火焰并围绕第三轴线旋转容器，平行于第一和第二轴。在优选实施例中，容器为圆柱形，第三轴线以垂直方向倾斜10°至60°之间，从而形成上部和下部区域。燃烧器火焰优选地被引导到下部区域中的沙子，并且破碎工具被定位成在上部区域中操作。通过同时使油砂与强热源接触，并使沙子受到剧烈搅拌，包裹砂粒的粘合剂迅速脆化，老砂粒受到热冲击，边界面在粘合剂和砂粒受到应力，从而加速粘合剂的分解和从各个砂粒中的脱落。

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