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一种微型零件快速置位-精确定位方法 被引量:2
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作者 李云利 王仲 陈佳 《机械科学与技术》 CSCD 北大核心 2014年第4期501-505,共5页
微型零件作为精密机械的重要组成部分,其定位在微小型系统中起着至关重要的作用。提出了一种V型叉-气阻尼的微型零件快速精确定位方法,V型叉实现微型零件的粗定位,阻尼实现微型零件的精确定位。然后采用图像处理的方法对其定位精度进行... 微型零件作为精密机械的重要组成部分,其定位在微小型系统中起着至关重要的作用。提出了一种V型叉-气阻尼的微型零件快速精确定位方法,V型叉实现微型零件的粗定位,阻尼实现微型零件的精确定位。然后采用图像处理的方法对其定位精度进行了分析,经过数据处理可知本方法达到了40μm的定位精度。最后分析了定位误差来源。该方法具有定位速度快,对零件无损伤,方法简洁,成本低的优点。 展开更多
关键词 微型零件 自动定位 V型叉 阻尼 定位精度
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V形伸缩货叉挠度计算
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作者 陈仕彬 李文龙 王彦宇 《机械工程与自动化》 2021年第5期201-202,205,共3页
通过对伸缩货叉的受力分析,计算出V形货叉带载时上叉板受到的切向力和法向力,在同一伸缩行程时,收叉状态比伸叉时的挠度大。依照普通托盘类货叉的挠度计算方法,得到V形货叉的理论挠度。该计算方法适用于不同长度伸缩货叉的挠度计算,为新... 通过对伸缩货叉的受力分析,计算出V形货叉带载时上叉板受到的切向力和法向力,在同一伸缩行程时,收叉状态比伸叉时的挠度大。依照普通托盘类货叉的挠度计算方法,得到V形货叉的理论挠度。该计算方法适用于不同长度伸缩货叉的挠度计算,为新的V形货叉开发及设计提供了基础及理论参考。最后通过实测一例货叉的带载挠度,验证了V形货叉受力分析及挠度计算方法的实用性。 展开更多
关键词 V形货叉 挠度 伸缩货叉 受力分析
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A new modified forked flap and a reverse V shaped flap for secondary correction of bilateral cleft lip nasal deformities 被引量:2
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作者 YAN Wei ZHAO Zhen-min YIN Ning-bei SONG Tao LI Hai-dong WU Di GAO Feng WANG Xin-gang 《Chinese Medical Journal》 SCIE CAS CSCD 2011年第23期3993-3996,共4页
Background The columella, nasal tip, lip relationship in the bilateral cleft lip nasal deformity remains a great challenge for plastic surgeon. An esthetically satisfying result is difficult to obtain. A subset of pat... Background The columella, nasal tip, lip relationship in the bilateral cleft lip nasal deformity remains a great challenge for plastic surgeon. An esthetically satisfying result is difficult to obtain. A subset of patients with bilateral cleft lip nasal deformity still require columellar lengthening and nasal correction and philtrial construction. This study aimed to provide a new method based on the forked flap to improve the final appearance of these patients. Methods A technique to correct this deformity is described. This consists of (1) a newly modified forked flap including the orbicularis oris muscle and nasalis muscle along the whole flap for columellar lengthening, (2) a reverse V shaped flap from the lower portion of the columella and the prolabium for normal size phitrum construction, (3) inserting the vermilion portion of the forked flap and advancing the nasal floor medially and anteriorly to lengthen and maintain the nasal septum side of the columella for proper tip positioning, (4) open rhinoplasty, allowing definitive repositioning of the lower lateral cartilages, (5) reconstruction of the orbicularis orismuscle as required, and (6) the flaring nostril floor advancing medially and constructing the sill. Results This technique was applied to 15 cases of secondary bilateral cleft lip nasal deformity. All the flaps took without signs of partial necrosis. In all cases, the nasal tip was projected forward with adequate columella elongation, and the height of the prolabium was added with normal size philtrial dimensions. Conclusions This method makes maximum use of the tissue containing the scar in the lip and limits tissues in the lower portion of the columella and the prolabium for adequate columella elongation and reconstruction with normal size philtrial dimensions. It is a very reasonable and useful method in correction of secondary bilateral cleft lip nasal deformities. 展开更多
关键词 secondary bilateral cleft lip nasal deformity COLUMELLA philtrum forked flap reverse V shaped flap
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