在线振动监测系统在立磨减速机上的应用

减速机是矿渣立磨的重要核心设备,在研磨物料过程中存在冲击性振动,其轴承和齿轮易发生故障,导致减速机被动停机或意外损坏。结合内部轴承、齿轮结构、位置,在减速机组装初期,预装振动和冲击脉冲传感器,经DCS系统数据采集,专家系统分析,对其运行状况进行精准诊断、系统化综合预判,实时输出判别结果。实践证明,在线振动监测系统的有效投入,能够及时主动预防减速机齿轮箱各关键部件的故障隐患,可实现设备管理从被动维修型到主动防预型的转变,是降低维修成本、提高经济效益的有效手段。     

Φ3.5M离心式选粉机故障分析与对策

1 概述 我厂Φ2.2×6.5m生料磨及水泥磨均选用Φ3.5m离心式选粉机。其结构如图1所示。在使用过程中,常出现下列故障: (1)主轴下轴承(3003124)损坏; (2)立式减速机振动及声响大; (3)选粉机内、外简体衬板、撒料盘、大小风叶磨损快。 这些故障,增加了维修工作量,降低了磨机的运转率。对此,我们进行了全面的分析与改进     

临界负荷工况下磨煤机频发故障的原因分析及处理

河南晋开化工投资控股集团有限责任公司二分公司2×600 kt/a合成氨装置4台航天炉配套6台磨煤机,正常生产时气化车间航天炉四开无备,一期项目、二期项目磨煤机均为两开一备;自2012年试车至今,磨煤机临界负荷状态下出现频发性故障,主要有液压油系统加载力异常波动、磨煤机拉杆及内件异常损坏、磨煤机减速机传动齿轮损坏、磨煤机本体频繁磨穿等。对故障原因进行分析与排查,找到各类故障的症结所在并采取有针对性的处理措施后,从源头上改善了磨煤机的运行工况,有效延长了磨煤机的运行周期,其检修费用也随之大幅降低。     

JS130型减速机故障处理

我公司2号水泥粉磨站2000年8月份投产,使用φ3.5m×12m球磨机,配JS130型主减速机,YR2000异步电动机及JMS660型慢驱装置.主减速机连续两次出现输入双列调心滚子轴承损坏故障,严重影响生产,在此浅谈故障处理过程.     

10t桥式起重机小车减速器的修复

近年来,小车行走机构中,经常出现立式减速机地脚连接螺栓松动、壳体破裂、齿轮损坏等现象。据统计,每台车年使用立式减速机少则3～4台,多则5～6台,影响正常生产,维修费用大大增加。为此,对其损坏原因进行了深入分析并采取相应措施,取     

平行轴齿轮减速机无泄漏密封结构设计

在锅炉烟气湿法脱硫系统的工程实践中,顶进搅拌器配套的立式平行轴齿轮减速机时常发生润滑油泄漏,导致减速机损坏的故障,严重影响了脱硫系统的正常运行。针对润滑油泄漏问题,特别改进设计了减速机输出轴的无泄漏密封结构,经多项工程的实际应用,杜绝了润滑油的泄漏,提高了减速机及搅拌机的工作可靠性。     

1Ot桥式起重机小车减速器的修复

近年来,小车行走机构中,经常出现立式减速机地脚连接螺栓松动、壳体破裂、齿轮损坏等现象.据统计,每台车年使用立式减速机少则3～4台,多则5～6台,影响正常生产,维修费用大大增加.为此,对其损坏原因进行了深入分析并采取相应措施,取得了一定成效.     

锅炉给水泵机组故障诊断及处理

运用油样分析和振动频谱分析相结合的方法,对锅炉给水泵机组轴承振动、温度的异常变化全面分析,准确诊断出减速机高速轴及低速轴止推轴承部位均发生不规则摩擦故障,通过针对性维修验证了故障诊断结果,并对故障进行了原因分析和处理。     

直交弧齿锥齿轮减速机修复的尝试

随着水泥生产设备大型化，为保证物料提升设备的可靠性和减少传动系统所占用空间，提升机配置的减速机目前普遍选用直交圆柱齿轮减速机，如大型板链提升机、生料入窑提升机上，而且一般选用进口减速机，这类减速机造价昂贵，一旦发生故障，减速机制造厂家又往往要求整机拆卸下来，返厂维修，整个修理加上往返运输时间一般需要15～20d。如果减速机在水泥生产旺季时发生故障，对正常生产影响很大。2014年10月正值水泥生产旺季，SJ公司生料工段NSE1000提升机减速机发生故障，为了尽量减少故障对生产的影响，我们尝试对该减速机进行现场修复，并获得成功，避免了故障对生产经营造成重大的损失。     

钻井用柴油机拉缸及轴承损伤原因分析

柴油机作为钻井施工作业的重要设备之一,具有工作效率高、经济成本低的特点,保障了钻井作业的稳定性和可靠性。但是由于柴油机在长时间、大功率的作业状态下,极易造成柴油机拉缸、主轴承损伤以及其他零部件损坏,导致柴油机出现故障无法进行正常作业,严重影响钻井施工的顺利进行。因此针对柴油机发生拉缸及轴承损伤等故障原因进行分析研究,并采取合理有效的维护维修措施,以确保柴油机良好的使用效率和工作效率。     

乙烯酮(双乙烯酮)下游产品废水的治理技术

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。     

A study of miscibility of blends of polybutadienes of varying microstructure

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.     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

粉煤灰中烧失量检测的不确定度分析

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。     

生物油的成分分析及物性测定

以添加FeCl2的ZnCl2-KCl混合熔盐裂解纤维素和秸秆,制得生物油。采用傅立叶变换红外光谱法和气相色谱-质谱法分析生物油的成分。结果表明,生物油中成分复杂,含有氧元素、多种有机化合物,主要包括酮类、醛类、酚类及羧酸类等。测定了20～80℃生物油的密度和粘度,发现生物油的密度与温度呈较好线性关系,而生物油的粘度均大于水的粘度,且不同熔盐体系对秸秆生物油的粘度无较大影响。     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

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     

分解炉扩径的技术改造

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     

Process of acceleration of filtration of viscose

Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969.