开式数控回转头压力机机身的动态有限元分析

使用MARC软件对J92K-25型开式数控回转头压力机机身进行了动态有限元分析,计算出了该机身的动态响应,探讨了高速压力机动态设计校核的方法。     

气动卡扣冲压机的设计

为了改变钢管打包时包装带卡扣的制作工序多、劳动强度大、效率低等状况,凌源钢铁集团有限责任公司钢管厂设计制造了一次成型气动卡扣冲压机,提高工作效率 3倍多,减轻了劳动强度,而且操作简便,易于维修。     

Properties of radiation stable, low viscosity impregnating resin for cryogenic insulation system

Impregnating resins in fusion magnet technology are required to be radiation stable, low viscosity, long usable life and high toughness. To meet these objectives, we developed a new epoxy based composite which consists of triglycidyl-p-aminophenol (TGPAP) epoxy resin and isopropylidenebisphenol bis[(2-glycidyloxy-3-n-butoxy)-1-propylether] (IPBE). The ratio of TGPAP to IPBE can be varied to achieve desired viscosity and working time. The boron-free glass fiber reinforced composites were prepared by vacuum pressure impregnation. The radiation resistance was evaluated by ⁶⁰Co γ-ray irradiation of 1 MGy at ambient temperature. The mechanical properties of the composites have been measured at room temperature and at 77 K.     

耐久压烫整理剂DMDHEU低醛化的研究进展

介绍了目前广泛使用的耐久压烫整理剂的ＤＭＤＨＥＵ在低醛化方面的研究进展这影响甲醛释放的因素。     

新型干法水泥生产线的粉磨系统

本文从粉磨物料的特性、产品的要求出发,结合近年来出现的新技术、新装备对干法水泥生产的主要粉磨设备及系统进行分析评述,提出各粉磨作业比较适宜的粉磨系统;生料粉磨应尽量采用辊磨系统;水泥粉磨以带辊压机或预粉磨的联合粉磨系统为优选方案;煤粉制备采用辊磨煤磨和带高效选粉机的风扫磨系统均可作为选择方案。     

塑料联接件的设计制造和使用

介绍常用塑料铰链联接，搭扣联接，卡夹联接，压力装配联接的联接件材料选择，成型方法，联接原理，形状设计等。     

田口方法在钼材料性能研究中的应用

描述了田口方法在钼材料性能研究中的应用,并详细给出了材料研究中热等静压工艺参数的设计过程。     

真空压榨辊传动侧故障分析及预防措施

针对造纸机发生真空压榨辊传动侧螺栓断裂情况进行故障诊断。通过实际测量真空压榨辊辊筒和轴,对纸机压榨部石辊、真空压榨辊、下压榨胶件之间受力分析,计算传动侧电机提供的扭矩和真空压榨辊传动侧螺栓所承受的抗剪切强度,研究了真空压榨辊螺栓断裂的原因。结果表明,真空压榨辊螺栓断裂的原因如下:(1)真空压榨辊筒与轴发生间隙配合;(2)真空压榨辊所承受的线压力过大;(3)螺栓实际承受的剪切强度大于其对应材料的许用切应力。本文还提出了防止真空压榨辊螺栓断裂的相关预防措施,应在纸机停机检修期间做好对真空压榨辊的维护与改造,为今后纸机安全运行提供必要的保障。     

新能源汽车电静液制动系统抗饱和反演控制

对电静液制动系统存在的未知非线性及参数时变特点,提出一种控制输入受限条件下的反演控制策略。建立电静液作动器的状态空间模型并表达为严格反馈形式,将建模误差及未建模动态视为未知干扰,结合反演步骤设计参数自适应律,实时估计未知扰动。设计抗饱和补偿器,将控制器输出与被控对象输入信号之差作为抗饱和补偿器的输入,构成反馈回路消除饱和现象。应用Lyapunov方法证明闭环系统的渐近稳定性,闭环系统信号一致有界,压力跟踪误差可通过改变补偿器的参数进行调节。仿真及试验结果表明,所提控制方法具有较强的自适应能力,与传统反演方法相比,鲁棒性和控制性能得到显著提高。     

LYP1050轮转胶印机控制系统设计

In order to meet the demand of printing market for high-speed, high-quality and highefficiency offset presses, a LYP1050 rotary offset press control system is designed. Firstly, taking the Inovance AC810 motion controller as the main controller and the Inovance IT6000 series touch screen as the human-computer interaction interface, the hardware platform of the LYP1050 rotary offset press control system was built by combining the servo drive unit. Then, the methods including the multi-axis synchronization control, the tension control of closed-loop speed and winding taper and the automatic registration control for the LYP1050 rotary offset press were proposed;at the same time, the lower computer program and human-computer interaction interface of the LYP1050 rotary offset press control system were designed. Finally, the reliability of the designed control system was verified by collecting the registration error of the LYP1050 rotary offset press prototype during actual operation. The test results showed that the registration accuracy of this rotary offset press could be controlled within ±0.05 mm, which met the registration requirements. The designed control system is safe and reliable, with good synchronization, high color registration accuracy, low failure rate, and wide versatility, which can provide references for the design of the similar rotary offset press control system. © 2021. All rights reserved.