回转中心

When power is transmitted to the elevator shaft, it drives the splined center wheel and the planetary mechanism which consists of three planetary wheels forming 120 degrees with each other and the inner gears drives the drum to rotate, the hoisting band brake is combined with the hoisting disc, and the drum's left ring is combined with the braking band brake, then the elevator has three status: hoisting, braking, and lowering down.

当动力传至升降机轴后，轴带动与花键联接的中心轮，三个互成120度的行心轮及内齿圈组成的行星机构，使卷筒回转，提升抱闸与提升盘结合，卷筒左端外圈与制动抱闸结合，这样升降机具有提升、制动、下降三种工作状态。

In order to achieve the setting up angle should be monitored and debugged, a new approach is brought up. With the CCD receiving the focusing spot of parabolic mirror, while rotating the parabolic mirror, collecting the focusing spot location information, the eccentric angle between the optical axis and the structural central axis could be found. System principle and design have been studied.The experimental results meet the need to test and monitor to the setting up angle of the discal parabolic mirror.

为了实现对抛物面反射镜的装配角度进行监控和调试，提出了一种通过CCD接收回转抛物面镜的聚焦光斑，同时旋转抛物面镜，采集光斑重心位置信息，从而计算出光轴与结构中心轴之间的偏心角的实现方案，并从方案原理和设计上对其进行研究和实验，实验结果证明该系统能应用于对盘状抛物面反射镜装配角度的测试和监控。

The company is mainly engaged in production of small sized precision CNC lathe, which have been widely used in communication, refrigeration, optical instrument, household appliances, auto, motorcycle, electronics, special electric machine, clockwork etc.

XKNC系列排刀式CNC车床、TX系列回转刀塔式CNC车床、SL系列纵切式CNC车床、加工中心，自动钻铣机，高速自动冲切裁断机六大类共计50多种规格。西安北村精密机械有限公司成立于2000年4月，是国内率先引进国外先进技术及生产经验的生产小型精密数控机床的中外合资企业。

The computer simulation software was developed for figuring the path curves and instantaneous speed of the lapping process.

文中从运动学和几何学原理出发，建立了工件精密研磨过程的轨迹方程，通过将复杂的研磨运动简化为在中心距一定条件下夹具绕研磨盘中心轴的回转运动及夹具自身的回转运动，对工件上任意点相对于研磨盘的运动轨迹及瞬时速度进行了分析计算，并开发了相应的计算机仿真软件，对其运动轨迹曲线及瞬时速度进行了分析。

In this paper, some clinostats developed by Center for Space Science and Applied Research in recent years,from monaxial to 3D (2 axes),from conventional to with micrograph,their construction and main performance parameters were introduced briefly.

本文介绍了近几年来，中国科学院空间科学与应用研究中心研发的几种新型回转器，从单轴到双轴，从一般到带显微观察，从它们的结构到其性能。

A composite rigid shell, with an aerodynamic profile, elongated longitudinally along the span of the blade, one longitudinal end of which is turnable towards a hub of the rotor and includes a blade root, said shell including at least one layer of reinforcing fibres agglomerated by a matrix comprising a synthetic rigidifying resin and laminated upper-surface and lower-surface skins extending from a leading edge to a trailing edge of the blade, each of said laminated skins comprising, from an inside towards an outside of the shell, a film of polyetherimide resin, at least one layer of plies of long and unidirectional fibres oriented substantially along a longitudinal axis of the blade, and at least one layer of fibre fabric, in which the directions of weft and warp yarns are oriented substantially at 45.degree.

复合刚性外壳，与气动的个人资料，拉长纵向沿跨度刀片，一纵年底，这是对回转中心的转子和包括叶根表示，蚬壳，其中至少1层加固纤维烧结由一个矩阵组成的一个综合rigidifying树脂和复合材料层合上表面和低表面皮肤延长，从领先到尾缘的刀片，每个说，叠层皮组成，从内对外界的壳，一个电影聚醚酰亚胺树脂，至少有一个层的层长和单向纤维导向的大幅沿长轴的叶片，并至少有一个层的纤维织物，在该方向的纬纱和经纱是面向大幅在45.degree 。

In this thesis, it is suggested that computer simulates the peripheries of log and determines the best-oriented center of log. Based on the present technology of Log centering and the situation of the lack of forest resources in the world and of the progressing of science technology.

本文综合世界森林资源短缺及科学技术进步情况，在分析现有定心技术的基础上，提出了采用计算机模拟原木来确定原木最佳回转中心的课题。

For professional research and development, production and small-scale dedicated Universal Precision Grinding Machine, CNC Machine Tool Products Center of the export-oriented manufacturing enterprises, and products are mainly have Grinding, Universal Grinding, milling cutter grinding machine, graver, drill, lathe tool grinder, universal tool grinder and accessories, Universal dividing head, rotary table, dividing plates, various types of chamfering machine, lathe grinder, cutting machine, such as a thimble.

东莞市巩达精密机械有限公司为专业研制开发生产万能磨刀机和小型专用精密机床、数控中心机床工具产品的出口型制造企业，产品主要有磨刀机，万能磨刀机，铣刀研磨机，雕刻刀、钻头、车刀研磨机，万能工具磨床及附件，万能分度头，回转工作台，分度盘，各类倒角机，车床研磨器，顶针切断机等。

Turning joy stick in center is easy for operating, even when handle by one hand. With 180°turning angle, it can do the least turning and turn around.

转向操纵杆在中心，操作轻松容易，单手就可以操作功能。180°大转向角度更可以作最小的转弯及回转。

On the condition that the axes of two chain wheels are in the same horizontal plane, the paper considers that the mesh drive of chain and chain wheel is equal to single small angle movement of four-rod mechanism every time on tight side.

在两链轮的回转中心同处一水平面的条件下，视紧边每一时刻链条与链轮的啮合传动为四杆机构作小转角的单向运动，建立起相应的链条速度模型，并据此分析了影响链传动中链条速度波动的因素，得到了一些有益的结

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。