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在阻燃输送带系列产品中,橡胶面整芯阻燃输送带以其性价比高、适应面广、维修更换方便等诸多特点被许多煤矿优先选作井下煤炭运输载体。美中不足的是, 相似文献
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高温耐热输送带的开发 总被引:1,自引:0,他引:1
1前言随着我国工业迅速发展,自动化程度不断提高,输送机的应用得到不断拓宽,与之配套的输送带需求与日俱增。特别是随着冶金、建材等行业的迅猛发展,耐热输送带的需求量在不断加大。同时,由于冶金、建材工业生产工艺的改进,生产能力的提高,对耐热带的质量提出了更高的要求。目前,我国生产的耐热输送带一般为耐热温度125℃,使用寿命短,仅为30~40天,更换频率高,给用户带来了诸多不便,更换新带是直接经济损失,而由更换新带造成停产导致间接的经济损失就更大了。高温耐热输送带是耐热输送带中的一个新品种,它除具有普通耐热输送带的优点外,关键… 相似文献
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随着我国冶金、建材、电力、矿山、港口等行业的迅猛发展.输送带在国民经济发展中的需求量也日益增加.特别是对于输送带使用的安全性和使用寿命也提出了更高的要求。而普通的装料工况条件下,输送带在传送落差高、尖角强冲击物料时,存在着耐冲击和抗撕裂性能差、使用寿命短等缺陷,易导致输送带体穿透、撕裂,以致断带等安全隐患。所以普通带已远远不能满足目前各种复杂条件下诸多输送线的使用安全性能要求。为满足要求,研制了防撕裂分层输送带。 相似文献
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高强度整芯难燃输送带是指纵向全厚度拉伸强度达到和超过 10 0 0kN·m-1 的整芯难燃输送带。现将其使用性能与钢丝绳芯输送带进行一下对比。(1)难燃和抗静电性能更好 ,使用更安全。高强度整芯难燃输送带是由充分浸渍难燃抗静电PVC糊的带芯高温塑化后贴覆PVC或PVG而成的 ,安全性能满足HG 14 7— 91标准的要求。而钢丝绳芯输送带是由钢丝绳芯和橡胶组成的 ,其中橡胶是易燃物 ,是安全的隐患。(2 )带体薄、质量小。相对于同等强度的输送带 ,整芯难燃输送带的质量仅为钢丝绳芯输送带的一半。以 160 0kN·m-1 的输送带为例 ,整芯… 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献