铜阴极始极片钉耳机的设计与改造

介绍铜电解始极片钉耳机的设计方法，阐述了偏心轮双滑块机构的设计原理，以及该机构的结构特征。简单分析了偏心轮双滑块机构在冲压设备上运用的可行性，为以偏心轮单滑块机构作为经典设计的常用冲压设备的设计提供了新的设计思路。     

结晶器振动结构参数分析

应用使结晶器实现正弦振动的偏心轮－杆式振动机构。从振动力学和偏心轮运动力学两方面，对差动式振动机构结构参数进行了设计计算，从而给出了确定差动机构结构参数的最优方法。     

步进式冷床升降机构偏心轮滚动轴承频繁损坏的解决

着重阐述了马钢第三钢轧总厂方坯连铸机步进式冷床升降机构偏心轮轴承频繁损坏的原因分析及采用滑动轴承替代的解决措施。     

棒材机组冷床偏心轮结构改造

针对安钢 2 60棒材机组冷床偏心轮更换不便的问题 ,对其结构进行改造 ,将整体式偏心轮改为剖分式 ,使其装拆方便 ,提高了冷床运行质量 ,同时减轻了维修人员的劳动强度 ,取得了良好的经济效益和社会效益。     

相位法调整步进式加热炉板坯的跑偏

通过太钢1549毫米热连轧厂1＃步进梁式加热炉板坯跑偏调整的实践,总结出用相位法调整板坯的跑偏,该方法对偏心轮机构传动升降的步进梁式加热炉,不论是何原因引起的板坯跑偏,都可通过调整偏心轮的相位角来修正,使板坯的跑偏量控制在规范规定之内。     

偏心轮式升降步进梁升降运动分析

偏心轮式步进梁因为液压缸铰点随着动梁移动,而使得其运动过程和负载分析变得复杂,分析了偏心轮式步进梁升降过程,给出了计算模型,并分析了参数C对步进梁提升量、步进梁提升能力的影响。为步进梁设计提供了设计依据。     

形封闭圆偏心轮机构的夹紧装置

本文介绍了一种封闭圆偏心轮机构的夹紧装置的工作原理和性能特点，给出了相应的力学分析。该夹紧装置不仅具有传统的偏心夹紧装置的操作方便、夹紧动作快、可自锁的特点与功能，而且松开工件时不需要其他辅助装置。     

结晶器非正弦振动系统的开发与应用

目前连铸机普遍使用的是传统的钢性四连杆机构和伺服液压振动。钢性四连杆机构寿命短、故障率高；由于传动臂较长，易产生扭转变形，影响振动相位差；采用偏心轮和调幅盘，不能在线调整振幅，振动参数也不能在线调整，导致铸坯表面质量差，常会出现较深的振痕及表面横裂纹。而液压振动是利用伺服液压缸驱动结晶器振动台振动，解决了四连杆机构不能解决的问题。但由于伺服阀始终在高频大行程状态下，     

棒线步进式冷床的运动分析及局部优化设计

棒线步进式冷床结构复杂,其动静齿条的齿形及床面齐头辊道的设计直接影响到轧件的成型质量。对步进式冷床进行了主轴偏心轮、动齿条框架的合成运动分析,采取了床面齐头辊道模块化悬挂、短静齿条优化设计,降低了装配累积误差量,提高了轧件成型质量。     

方坯连铸拉坯速度与振动频率的匹配关系

本文根据四偏心轮式振动机构的振动特性,对德方给出的方坯连铸机自动开浇过程中,拉坯速度与振动台振动频率的匹配关系进行了分析,并得到了有意义的结论.     

消除轧辊偏心影响的自适应数字系统的分析与研究

目前 ,我国自适应控制轧辊偏心装置多半还只是对偏心力的补偿 ,而探讨轧辊转动定相自适应及偏心力自适应的双重数字控制系统尚不曾见。对轧辊消除偏心自适应数字控制系统进行了分析和研究 ,仅供我国轧钢专业的同行们参考     

相邻水平矿柱开采扰动影响分析

垂直相邻中段因采矿方法的变更,造成水平矿柱偏载作用,恶化顶板岩体稳定性,给生产安全造成不良影响。基于结构力学原理,建立了上下中段矿柱错位布置偏载作用力学模型,推导了水平矿柱弯矩、剪力和安全系数计算公式,并结合工程案例开展了相关理论计算。研究表明:偏载作用对预留水平矿柱力学性能劣化影响明显,随着水平矿柱厚度的减少,安全系数越来越小;根据建立的偏载矿柱力学模型,可快速计算不同偏载程度作用下预留水平矿柱弱化关系,开采优化设计提供指导。     

Mechanomyographic and electromyographic responses to eccentric and concentric isokinetic muscle actions of the biceps brachii

The purpose of the present investigation was to examine the effects of forearm angular velocity on the mechanomyographic (MMG) and electromyographic (EMG) responses to eccentric and concentric isokinetic muscle actions. Ten adult male volunteers (mean+/-SD age=23+/-2 years) performed maximal eccentric and concentric muscle actions of the forearm flexors at 30 degrees, 90 degrees, and 150 degrees s(-1). There was no significant (P> 0.05) velocity-related change in peak torque (PT) for the eccentric muscle actions, but there was a significant (P < 0.05) decrease in PT for the concentric muscle actions. For the eccentric and concentric muscle actions, there was a significant (P< 0.05) velocity-related increase in MMG amplitude. There was no significant (P < 0.05) change in EMG amplitude across velocity for the eccentric or concentric muscle actions. The results indicated velocity-related dissociations among the PT, MMG, and EMG responses to maximal eccentric and concentric isokinetic muscle actions.     

Eccentric and concentric strength of the shoulder and arm musculature in collegiate baseball pitchers

Many pitching injuries occur during deceleration of the upper extremity when the muscles of the shoulder and arm are acting eccentrically. Published information regarding eccentric muscular strength in baseball pitchers is nonexistent. The purpose of this study was to assess bilateral isokinetic eccentric and concentric muscular strength of the shoulder's external and internal rotator muscles and the elbow's flexor and extensor muscles in a group of collegiate baseball pitchers (N = 25). Isokinetic strength was assessed at 1.6, 3.7, and 5.2 rad/sec. Our findings indicate that the internal rotator muscles were always stronger than the external rotator muscles and that the concentric and eccentric external-to-internal strength ratios ranged from 62% to 81%. The eccentric strength of the shoulder rotator muscles averaged 114% that of concentric strength. The concentric and eccentric elbow extension-to-flexion strength ratios ranged from 71% to 110%; eccentric strength averaged 33% higher than concentric strength. No differences were noted between dominant and nondominant limbs for any of the strength measures or ratios. Clinically, the findings of this study can serve as a reference during the evaluation, rehabilitation, and conditioning of throwing athletes.     

不同底吹位置对VD精炼脱碳过程的影响

采用数值模拟方法研究了VD精炼过程中不同底吹位置对钢液流场及脱碳过程的影响。研究结果表明:双底吹脱碳效果最好,偏心底吹次之,中心底吹最差;在偏心底吹下,当底吹位置距钢包中心0.4R～0.5R时脱碳效果最好,终点碳的质量分数最低为39×10-6;在双底吹条件下,当底吹位置距钢包中心0.50R～0.65R时脱碳效果最好,终点碳的质量分数最低为25×10-6;与偏心底吹相比,采用双底吹时终点碳的质量分数可降低18%～45%。     

带蜗轮的特殊偏心套制造工艺分析

偏心调整机构被广泛应用于冶金及化工机械设备,主要用于轴承及齿轮径向间隙的调整,本文以线材轧机机组应用的偏心套加工为例,从加工基准选择、工艺路线分析、偏心距保证、配重等方面进行了全面的阐述,全方位保证偏心套的加工精度。     

考虑柱与独立偏心基础协同工作的基础底面压力的计算

旧城区改造房屋的独立基础设计，往往受到场地限制，较为经济可行的方法是设计成单向偏心基础。偏心基础由于有偏心荷载作用，可能会引起基础倾斜或转动。因此，设计时可考虑基础与刚性联接柱协同工作。本文根据文献等资料进行分析，得出较为实用、安全、可靠的设计方法。     

Investigation of Eccentrically Loaded CFRP-Confined Elliptical Concrete Columns

This paper presents a finite-element analysis study of elliptical concrete columns, converted from rectangular cross sections and confined with carbon fiber-reinforced polymers (CFRP) through an enhancement/strengthening procedure, under eccentric loadings. The parameters considered for the finite-element analysis study include various eccentric loads, and the number of CFRP layers as well as their orientation with respect to circumferential axis of concrete columns. Validation of the finite-element model was performed leveraging an experimental study reported in the literature. Study findings suggest that eccentric loading versus concentric loading considerably reduces the efficiency of the CFRP wrapping. The study, however, also shows that it is possible to diminish the adverse effect of eccentric loading through proper adjustment of the wrap configuration, i.e., the number of layers as well as the orientation of the fibers.     

炼铜卧式转炉炉内铜水偏心力矩的分析与计算

讨论了在转炉生产过程中炉内铜水偏心力矩的产生及其变化趋势 ,并提出了炉体在不同转角时炉内铜水偏心力矩的计算方法