输送机的功率计算我有个输送线是输送纸卷 输送线长20米（链条式上下链子）链子两端是轴承座位轮子纸卷重300kg 每米放3

塑料：
1、中性笔外壳
3、一次性注射器
4、电视机外壳
7、电木
橡胶：
2、轮胎
5、输送机皮带
6、医用手套
8、雨衣

滚子转速是：1.4/(0.4*pi) 转 /s
皮带长：0.4*pi+ 2*4.178 米/槽,多个槽乘以相应的系数；
我只给公式,具体值自己算.

解题思路：根据物质的类别进行分析，手机外壳由塑料制成，轮胎由橡胶制成，尼龙绳属于纤维制品，一次性注射器由塑料制成，电视机外壳由塑料制成，输送机皮带由橡胶制成，气球由橡胶制成进行解答．

尼龙绳属于纤维制品；手机外壳由塑料制成，一次性注射器由塑料制成，电视机外壳由塑料制成，属于塑料制品；轮胎由橡胶制成，输送机皮带由橡胶制成，气球由橡胶制成，属于橡胶制品．
故答案为：③；①④⑤；②⑥⑦．

点评：
本题考点： 合成材料的使用及其对人和环境的影响．

考点点评： 本题考查了常见物品的制取材料，完成此题，可以依据已有的知识进行．

自己翻的,不过你可以再确认一下术语对不对
Belt type roller machine is a kind of roller conveyor that uses belts as its conveying mechanism.Compared with chain type roller machine,the belt type has advantages such as compact structure,low noise,stable and reliable running,no grease stains,low costs and transformation friendly,etc.,which explain its wide application in the logistics industry.
The primary focus here is on the structural design of the belt type roller machine.Based on the structural characteristics and the relevant parameters of the workpieces to be conveyed,a sketch design of the roller machine structure is finished,including the selection and calibration of belts,the calculation of driving power and the selection of driving motor; the selection and calibration of bearings,the structural design and stiffness check of the wheels.Besides,the structure and dimensions of the roller machine is determined according to the calculated results.The general assembly drawing and some essential components are graphed as well.