Perpendicular in the certain scope promote with the level porterage heavy thing much action derrick 械 .Call hoist again.Belong to the material porterage machine.The work of the derrick the characteristics is to do by fits and starts sport, taking to anticipate in a work the circulation,the luck move,unload etc. action of correspond organization is alternation work of.
China ancient times irrigation 桔 used in farmland?BE the arm type the embryo of the derrick.14 century, the Western Europe appear the manpower and the 畜 dint to drive of turn and move the arm type derrick.Period 19 centuries ago, appear a bridge type derrick;Derrick of the importance wear away a piece,such as stalk,wheel gear, and mourn etc. a beginning adoption the metals material manufacturing, and beginning adoption the water power drive.19 period after century, the steam drive of derrick gradual replace water power drive of derrick.20 century 20's beginning, because of electricity industry and I.C. engine industry quick development, take the electric motor or the I.C. engine as motive equip of various derrick is basic formation.
The derrick is main to include to rise organization,circulate organization,become an organization and turn round the organization and metals structure etc..Rise organization is the basic work organization of the derrick, they mostly from hang to hang the system and winch to constitute, have already pressed system to ascend and descend a heavy thing through a liquid as well.Work circulated organization in order to and lengthways the level luck to move a heavy thing or adjust derrick position, general from electric motor,decelerate machine,make to move the machine and car wheel to constitute.Become an organization an equipment a type a derrick at the arm up, the arm 仰 the hour range let up, the 俯 descend the range enlarge, cent the balance change and not the balance change two.Turn round organization to make in order to the arm turn round, from drive equip and turn round to accept equip to constitute.The metals structure is the framework of the derrick, the main loading piece,such as the bridge,the arm and door, can is box the form structure or the 桁 structure, can also for the stomach plank structure, have of can use a steel as to accept beam.
The derrick can is divided into according to the dissimilarity of the structure:The ① bridge type derrick.Can at the rectangular place and its sky homework, used for car more,the warehouse,open-air heap field the product of[with] etc. pack to unload, having a beam type derrick,bridge type derrick,Dragon gate derrick,cable 索 derrick,carry bridge...etc..The ② arm type derrick.Can in the circular place and its sky homework, much used for open-air pack to unload and install etc. work, have a derrick and float to swim a derrick,mast derrick,wall a line derrick and the deck derrick etc.s.Moreover, derrick can also according to drive way,the work type,flexibility and use etc.s to carry on a classification.
一句两句还可以，这么多，累傻小子呢吗？楼主真会利用免费平台。并且悬赏分居然是0~~~
Crane and the history of the development of the concept
At a certain scope and level of vertical lifting many of the action to carry a heavy load lifting equipment. Also known as the cable car. Belong to material handling machinery. Crane's work is characterized by intermittent exercise to do, that is, a job at reclaiming cycle, transport, unloading, etc. The corresponding action is the turn of the job.
Ancient Chinese irrigation used orange? Is the embryonic form of boom-type cranes. The 14th century, Western Europe appeared in human and animal-driven boom-type crane rotation. The early 19th century, a bridge crane; cranes wear items such as essential axis, gear and began to use metals such as spreader materials, and introducing the hydraulic drive. The late 19th century, steam-driven crane gradually replaced the hydraulic-powered crane. The beginning of the 20th century's 20, because of the electrical industry and the rapid development of industrial internal combustion engine, electric motor or internal combustion engine to power devices for a variety of crane is basically formed.
Crane main lifting mechanism, operating agencies, luffing mechanism, slewing mechanism and metal structure. Crane hoisting mechanism is the basic job agencies, they are hanging from the winch system and components, but also through the hydraulic system of lifting heavy objects. Vertical run to the level of migration body weight or adjust the location of cranes, is normally provided by electric motors, reducers, brakes and wheel components. At only equipped with luffing jib type crane, the arm looked up and when the rate of decrease, the rate increased when leaned over, sub-balance variation and variation in two non-equilibrium. Slewing mechanism to enable the rotary arm is driven slewing devices and device components. Metal structure of the skeleton is a crane, main bearing parts such as bridge, jib and gantry for the box structure or truss structure, but also for the web structure, and some can be used as the supporting steel beams.
According to the structure of different crane can be divided into: ① bridge-type cranes. Venues in rectangle and over homework, for the many workshops, warehouses, open storage space for loading and unloading of goods, etc., there is beam cranes, bridge cranes, gantry cranes, cable cranes, carrying bridges. ② jib cranes. In the circular space over the homework and are used for loading and unloading and installation of outdoor work, have portal cranes, floating cranes, mast crane, wall lines, such as cranes and deck cranes. In addition, the crane can also drive the types of work, mobility and use of the classification.
求高手翻译英文 要通顺点的 万分感谢~
消除4.2盘剥
最简单的方式去避免欺骗性是一种工具,吊装
沿着正常(工具缩回cc-point矢量)。
这个过程是遵循“frontside如果欺骗性时发生
三角”。以“rear-bottom用笔三角”
解决了由一组工具倾向的适应
和工具解除。这一组合允许一个妥协
增加了扇贝之间的高度(诱导
倾斜角度的增加)和增加了
工具材料(诱导其他提升)。
该算法总是优先考虑增加了
倾斜角度。但是一个预先定义的最大值
(换句话说倾向。45°角)是达到或如果这种倾向
角度变化是不被允许的(如“低功耗
三角”),该算法计算了必要的工具
解除。它可以有利于高度弯曲凹
大面积使用一个更大的角度,在最大的倾向
为了避免un-efficient凿击的免费工具的路径。
图6显示一个刀具路径生成与最大限度
45°倾斜角度。在对cc-points凹
区(A、B、C、D、E、F)、大型起重导致工具
不规则的行为,表现在刀具路径
图6分的工具中心’,b,c ',' d、e、f ' ' '。一个
55°倾斜角度最大的消除
问题。必要的计算工具倾向的改变
提升的金额与工具,使工具凿击的自由
在两个反应步骤完成。在第一步,所需的增加
倾斜角度和工具的起重工具是多少
所以没有顶点干扰计算的工具。在一个
第二步,工具的倾向的角度进一步
增加(或更多)求解工具举起的干扰
有约束的工具和/或脸。第二
rear-bottom一步,所有的“三角”表述他们的顶点
以下是消除工具底平面).(容易检查刀具路径生成强烈减少时间,
因为一个相对大量的三角形(15 - 25%)
为进一步计算就被扔掉了。这一次
减少更强,因为所需要的时间
凿击自由位置计算基于边缘、
面对相当长相比,所需的时间
基于角度计算一个顶点。这两个步骤
算法相比,当然是创新
[7],在算法的计算自由凿击
倾向上做一个三角形的角每三角形的基础
(vertices-edges-face),消除算法通过磨损公差
价值。一个更广阔的公差带将会导致一个较小的工具
倾角(或工具起重),使工具凿击的自由。
表1清楚地显示出的部分,图3所示
最大倾角角度所需要的盘剥
在一个特定的cc-point消除强烈的增加而增加
当磨损公差越变小。
二十年后，路易斯·S·B·李基博士(于1972年逝世)所著的《奥杜威峡谷》终于出版上市，这本书总结了他1947年之前的全部工作成果。1972年，理查德·李基宣布，在东鲁道夫发现许多南方古猿和260万年前的人类头骨。在非洲，早期人类的身体和文化进化得到了证实，这同时也说明了，查尔斯·达尔文提出的“非洲可能是人类的摇篮”的猜想十分正确。
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