A helical drive in-pipe robot based on compound planetary gearing

The modern society is fuelled by very comprehensive grids of gas and liquid pipelines. In recent years, various in-pipe robots have been developed for inspection and maintenance tasks inside such pipes. In this paper, a novel in-pipe robot is proposed and developed for gas/oil well interventions at thousands of meters downhole. Due to the nature of such intervention, in-pipe robot design must be capable of carrying a very large payload, as large as 2500?N inside a pipe with diameter as small as 54?mm. The proposed design concept is based on a compound planetary gearing system. One of the major novelties of this design is the use of pipe wall as a ring gear for one stage of the compound planetary gear system; the other novelty is the generation of helical angle when the planetary gears are expanded to press on the pipe wall. The proposed concept is compact, efficient, and has never been reported before. In this paper, the helical angle, the velocity, and load capability of the proposed system will be analyzed. The load transportation capability of the proposed robot is also measured based on an experiment. Initial data have shown great potential in carrying large payloads.     

提高复合塔板操作弹性和通量研究

在内径为 5 0 0mm和 30 0mm的塔内 ,以空气 水为物系 ,测定了不同结构 (浮阀 筛孔穿流板、非均匀开孔率穿流板、双孔径穿流板 )的穿流板与 2 5 0Y规整填料组成的各种复合塔板的流体力学性能。试验结果表明 :浮阀 筛孔复合塔板操作弹性小、气液处理量小 ;非均匀板复合塔板与均匀板复合塔板相比 ,操作弹性大2 0 %— 6 0 % ,气处理量大 2 0 %— 80 % ,液处理量大 70 %左右 ;双孔径复合塔板比单孔径复合塔板处理量略微增大 ,操作弹性高达 3.5以上。     

关于有机-无机复混肥国家标准

介绍有机无机复混肥料国家标准的范围、技术要求和试验方法。     

磷复肥喷浆造粒内筛分技术的研究与应用

探讨了影响喷浆造粒内筛分的诸因素，提出强化筛分的措施并建立新型内筛分能力的计算式，为工程应用提供了理论依据。     

PE-LLD／EVA／Mg（OH）2／复合阻燃剂高效无卤阻燃体系的研究

采用线形低密度聚乙烯/乙烯-醋酸乙烯共聚物作为复合材料主体,表面处理过的氢氧化镁(Mg(OH)2)为主阻燃剂,以微胶囊化红磷和自制硅类阻燃剂为核心的复合阻燃剂为阻燃增效剂,重点探讨了Mg(OH)2和复合阻燃剂的阻燃效果。结果表明,Mg(OH)2与复合阻燃剂并用具有良好的协同效应,当Mg(OH)2用量40份,复合阻燃剂5～7份时,可获得较高的氧指数,垂直燃烧试验通过FV0级,且材料抗静电能力提高,力学性能、加工性能较好。     

壳聚糖及其衍生物与碘的络合物的抑菌性质研究

利用壳聚糖(CTS)、水杨醛改性壳聚糖(S-CTS)和还原水杨醛改性壳聚糖(RS-CTS)与碘以不同质量比制备络合物,通过碘量法测络合物的摩尔比,UV光谱和IR光谱对络合物进行了表征。考察了CTS和RS-CTS与碘络合物的抑菌性质。结果表明,壳聚糖及其衍生物与碘络合物摩尔比(壳聚糖及其衍生物结构单元与碘之比)分别为:n(CTS)∶n(I2)=1∶0.38,n(S-CTS)∶n(I2)=1∶0.85,n(RS-CTS)∶n(I2)=1∶0.73。CTS和RS-CTS与碘的络合物对金黄色葡萄球菌抑菌敏感度为高度敏感。     

芳香族硝基化合物还原制芳胺生产工艺评析

本文简要叙述了芳胺用途、常用合成工艺,重点对各生产工艺进行了技术、经济评析,并对芳香族硝基化合物还原方法的选择提出了自己的看法。     

压出过程中胎面胶流动特性的研究

应用Monsanto加工性能试验机(MPT)对胎面胶进行压出流变试验。在实验条件下,考察试样熔体的流动特性及其影响因素,并作初步的分析和讨论。实验发现,试样的流动曲线可近似用指数方程描述;而熔体粘度对温度的依赖性则大体上符合Arrhenius方程。     

磷钨杂多酸催化乙醇和乙酸酯化反应的研究

以多孔钛片为支撑体,制备了磷钨杂多化合物薄膜化催化剂。在膜催化器上,考察了薄膜化催化剂对乙醇和乙酸合成乙酸乙酯的催化性能。结果表明,薄膜化催化剂显著提高了催化活性;当n(乙醇)∶n(乙酸)=1.5∶1,原料流量2.55mL/h;在反应温度为110℃时,乙酸乙酯产率可达97%,且薄膜催化剂的处理很方便,不污染环境。     

谢尔炉炭黑－PVC抗静电管材料生产技术研究

本文通过实验，研究了谢尔炉炭黑填充抗静电ＰＶＣ管材料的生产技术，为ＰＶＣ管材的生产打下基础。