2) polygonal line drum
折线卷筒
1.
The problems,such as low efficiency,heavy raw materials consumption,high cost and so on,existed in the production of polygonal line drum;therefore,the method was proposed that was substituting casting the polygonal line grooves for the machining and the grooves surface alloying.
折线卷筒生产加工中存在效率低、原材料消耗大、成本高等问题,为此提出了以折线绳槽铸造成形替代机加工成形,以及绳槽表面合金化的方法。
3) a new type of polygonal line slot drum
新型折线槽卷筒
1.
It adopts horizontal collocation and a new type of polygonal line slot drum,which resolves the defect of the existing hoisting mechanism,so that the hosting mechanism can wok stably and reliably.
阐述了优化设计在塔式起重机新型起升机构产品开发中的作用,该机构采用一字形布置和新型折线槽卷筒,解决了现行起升机构的缺陷,保证起重机械稳定可靠工作。
4) parallel line on a broken line
折线平行线
1.
This thesis summarizes an algorithm of how to locate a parallel line on a broken line,in order to solve the problem that GIS(Geography Information System)cannot describe the several lines in the same telegraph poles of the Jilin province 66 kV electric net exactly,and made an OO(object-oriented) programme to accomplish this algorithm in the computer.
针对吉林省66 kV及以上电网GIS中遇到的不能准确、直观描述同塔并架多回输电线路问题,提出了一种折线平行线算法,并且通过面向对象的软件开发方式实现了这个算法。
5) parallel wound bobbin'
平行卷绕筒子
6) parallel-fold jaw cylinder
平行折夹板滚筒
补充资料：折线
用线段依次连接不在一直线上的若干个点所组成的图形。各线段称为折线的边；各点称为折线的顶点，其中第一点称为起点，最后一点称为终点。起点和终点重合的折线称为封闭折线或多边形。不相邻的两边都不相交的折线称为简单折线。如果对于简单折线的任一边所在的直线，折线其他各边都在其同侧，则称此为凸折线；否则称为凹折线。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条