不同工作制曲柄连杆式飞剪机的设计

通过对曲柄连杆式飞剪机工作制和工作特点的分析,介绍了不同工作制飞剪机的设计要点,给出了在设计中应遵循的原则,从而使其设计更加合理.     

Use of TNSAC in phosphate adsorption studies and relationships. Isotherm relationships and utility in the field

There is a need for developing low cost, easily and abundantly available, yet efficient, adsorbents for the removal of phosphates during the tertiary treatment of wastewaters. The tamarind nut shell activated carbon (TNSAC) prepared on a laboratory scale has been used to evaluate its performance for phosphate adsorption. This paper describes the laboratory production of this adsorbent material in its various forms, and discusses the effects of the TNSAC process variables (the unrinsed and rinsed forms of the TNSAC and the impregnation ratio) on its performance in adsorbing phosphate. The material has been shown to be a good alternative adsorbent. As much as 95% phosphate removal by the unrinsed TNSAC is possible in about 30 min under the test conditions. The phosphate adsorbing capacity is about two times higher for the unrinsed TNSAC in comparison to the rinsed TNSAC. The adsorption rates, however, transit to extremely low rates towards the end when equilibrium conditions could be attained in about 2 h contact time. The phosphate removal mechanics are adsorption and precipitation/ion exchange when unrinsed TNSAC is used, and adsorption alone for the rinsed TNSAC. The maximum phosphate removal is found to take place at an impregnation ratio of 1.0 for both forms of the TNSAC.     

颗粒状物料气力输送系统中输料管的连接方式

对颗粒状物料的气力输送 ,人们往往只重视所要采用的输送方式 ,而忽视了输料管连接方式的正确选择、施工与安装。输料管连接方式的正确与否 ,直接影响到输送量和物料的品质。详细介绍了常用的几种连接方式 ,分析了它们的优缺点 ,并提出了比较合理的连接方式     

BOSCH伺服控制系统在ZJ19B卷接机组中的应用

介绍BOSCH伺服控制系统成功应用于ZJ19B卷接机组传动系统中,使机器供丝、供纸、刀头、嘴机部分各个电机的运行更加稳定,控制精度显著提高;减少因控制精度不够而引起的非正常停机次数,提高机器的有效作业率,节约原料;同时使烟支的重量、圆周、紧头等各项指标合格率显著提高。     

护坡工程空心螺母块立浇及安装施工技术研究与应用

空心螺母块因其外形简单,近年来在河湖生态护坡工程中被广泛应用。但护坡工程使用的空心螺母块数量较多,传统的平浇法预制,所需预制场地大且平整度要求高,螺母块运输安装费时费力、外观质量难以保证。文章针对护坡工程空心螺母块浇筑和安装的特点研究出一种操作简便、切实可行的连续立浇预制安装的施工方法,经过工程实际应用,有效保证了预制块的浇筑质量,提高了预制块的运输铺设效率,节约了预制场地的兴建面积。     

非对称复杂形状连杆模锻的三维有限元模拟

作为重要的传力件，连杆在工业中具有广泛的应用。以一个非对称复杂形状连杆为对象，在对其进行工艺分析的基础上，采用大型体积成形有限元数值模拟软件DEFORM3D对其模锻工艺进行了数值模拟，得到了变形过程不同时刻连杆的变形情况、等效应变和等效应力的分布以及连轩模锻成形时的压力行程曲线，最后给出了结论。     

连接管对调压室涌波水位和水锤压力的影响

在传统大波动过渡过程计算中,调压室底部连接管的影响往往是作为阻抗孔来考虑,在连接管较长的情况下,采用阻抗孔处理时而忽略了连接管的水体弹性,因而容易造成较大误差。通过建立考虑了连接管及不考虑连接管时的调压室节点数学模型,采用Gardel公式来处理调压室的阻抗系数,将调压室的阻抗系数变为负荷实际情况的动态阻抗系数,并结合具体工程实例来分析连接管的长度及管径的变化对调压室涌浪、蜗壳进口压力以及机组转速所产生的影响。研究结果表明,对于连接管较长的情况,应考虑到连接管的作用,为了能充分反射水锤,连接管的面积不宜过小。     

聚乙烯管材的连接方法和技术

为充分发挥聚乙烯（PE）管材的先进性，经济性和安全性，对PE管材的各种连接方法进行了广泛的研究。介绍了PE管材的热熔对接焊，电热熔焊，热熔承插焊，鞍形/侧壁熔焊，以及钢塑过渡接头连接方法和技术，并对热熔对接焊和电热熔焊作了较深入的探讨，同时进一步分析了不同塑料管材间的焊接方法。     

组合塔式结构及其效能研究

提出组合塔式结构的设计理念与基本形式,并对其受力机理进行了深入研究。组合塔式结构的基本特征是在塔楼之间设置多道连接桁架,形成由多个单塔与连接桁架构成的巨型结构,使结构的整体抗倾覆性能显著提高。深入研究了连接桁架刚度对结构效能的影响,引入了组合塔式结构的整体弯矩系数。研究结果表明：与传统的结构形式相比,组合塔式结构的抗侧力效能显著提高,可以大大突破单塔的高宽比限值,在现有建筑材料与施工技术条件下,能够建造更高的超高层建筑,并成为未来超高层建筑发展的主要方向之一。     

Connecting parameters optimization on unsymmetrical twin-tower structure linked by sky-bridge

Based on a simplified 3-DOF model of twin-tower structure linked by a sky-bridge, the frequency response functions, the displacement power spectral density （PSD） functions, and the time-averaged total vibration energy were derived, by assuming the white noise as the earthquake excitation. The effects of connecting parameters, such as linking stiffness ratio and linking damping ratio, on the structural vibration responses were then studied, and the optimal connecting parameters were obtained to minimize the vibration energy of either the independent monomer tower or the integral structure. The influences of sky-bridge elevation position on the optimal connecting parameters were also discussed. Finally, the distribution characteristics of the top displacement PSD and the structural responses, excited by El Centro, Taft and artificial waves, were compared in both frequency and time domain. It is found that the connecting parameters at either end of connection interactively affect the responses of the towers. The optimal connecting parameters can greatly improve the damping connections on their seismic reduction effectiveness, but are unable to reduce the seismic responses of the towers to the best extent simultaneously. It is also indicated that the optimal connecting parameters derived from the simplified 3-DOF model are applicable for two multi-story structures linked by a sky-bridge with dampers. The seismic reduction effectiveness obtained varies from 0.3 to 1.0 with different sky-bridge mass ratio. The displacement responses of the example structures are reduced by approximately 22% with sky-bridge connections.