变频器在BRW-400/31.5A乳化液泵中的应用

为解决乳化液泵供液不稳定、控制精度差、参数调节难等问题,采用理论分析方法介绍了变频器结构原理、工作特性。在挖金湾矿井中的应用表明,变频器在变频/工频切换下无极调速乳化液泵运转,乳化液泵实现了恒压供液。通过对变频器在乳化液泵的应用研究,良好地解决了控制乳化液泵面临的问题,降低了设备损耗,提高了矿井工作效率,对挖金湾煤业具有重要意义。     

新型铝热连轧乳化液润滑效果实验研究

制备一种新型铝热连轧乳化液,其采用复合乳化剂以形成较稳定的乳化液体系,从而减少轧制油耗,改善轧件表面退火清洁性及保证乳化液的使用寿命;同时辅以高效极压剂以弥补稳定型乳化液润滑性能不足的缺点。通过单机架多道次模拟热连轧条件下润滑实验,研究新型乳化液对铝板热轧过程轧制力和终轧厚度的影响,并考察乳化液的稳定性和铺展能力。结果表明：新型乳化液具有优良的轧制润滑效果,相比传统商品乳化液轧制力降低了52%~169%,终轧厚度减小了48%~106%;新型乳化液具有良好的稳定性、热分离性和铺展能力,可改善轧后铝板表面清洁性。     

矿用乳化液泵站在线监测系统设计应用

针对传统乳化液泵站检测方式存在的效率低、检测精度不高、工人劳动强度较大以及结果可靠性不高等问题,通过对矿用乳化液泵站常见故障类型进行分析,提出了一种基于C/S和B/S混合模型的乳化液泵站在线状态监测方案。通过对系统软、硬件设计及现场布置和应用试验验证得出：系统可以准确识别乳化液泵站故障,能够实现对乳化液泵站运行过程的全方位可视化远程在线监控,监控识别故障准确率≥98.7%,误警率<1.3%,有效避免了乳化液泵站事故的发生,保证煤矿液压支架系统的稳定运行,极具推广价值。     

气液两相流体冷却润滑技术-油气润滑

不污染环境，也不会象采用其它润滑方式时对乳化液及乳化液系统等构成严重影响甚至缩短了乳化液的更换周期。     

乳化液泵站液压系统设计及基于AMESim系统建模仿真分析

介绍了一种自行设计的乳化液泵站液压系统,对系统的工作原理以及流量自动卸载子系统进行了阐述,并运用AMESim系统仿真软件,对本液压系统进行建模仿真,对仿真结果进行了分析,得出了影响乳化液泵站液压系统稳定运行的关键因素。     

基于AMESim三柱塞乳化液泵动态仿真分析

乳化液泵是煤矿综采工作面上必不可缺的装置,主要完成机械能和液压能之间的转换,保证乳化液能够顺利、稳定并快速地输送到液压支架和煤矿综采工作面上的其他设备,使得各个设备能够实现自己的功能,满足实际生产的需要。基于AMESim软件对三柱塞乳化液泵进行动态仿真,得到了理想的仿真结果。     

乳化液在煤矿的应用

本文介绍了乳化液在煤矿机电设备上的应用情况，分析了乳化液使用过程中存在的问题。针对这些出现的问题，从影响乳化液的使用和自身特性的两个方面进行分析研究，提出了一些改进建议，并对矿用传动介质今后的发展提出了一些看法。     

一种新颖的乳化液浓度的检测方法

提出了一种新的乳化液浓度测量与计算方法.该方法以文丘里流量计测量原理为基础,利用伯努利方程计算出所配乳化液的浓度.并且根据不同的进水压力,通过调节乳化油的液面,来改变所配乳化液的浓度.方法简单直观.利用此原理设计的自动配液装置结构简单,配液精度稳定,适合煤矿井下及相关场合应用.     

延长乳化液寿命的途径

从乳化液的化学性能、处理系统和维护管理三个方面，探讨了如何延长乳化液的使用寿命。     

单机架冷轧机乳化液系统的改进与应用

在冷轧机组中，乳化液起冷却和润滑作用。在轧制过程中，大量的铁粉磁性粒子悬浮在乳化液中，对轧机和产品都有直接的危害，有效地控制乳化液中铁粉含量是乳化液控制系统设计的关键。介绍该系统的设计原理及其应用情况。     

冷却切削液的集中循环系统

介绍了冷却切削液集中循环的特点及集中循环系统的例子，指出了设计是应注意的问题。     

基于磁流变液的蠕动驱动方式研究

提出了一种利用磁流变液这一新兴智能材料来实现微机器人的蠕动驱动方式。文章分析了其运动规律及控制电压的时序,并通过ADAMS仿真验证了其可行性,为后续的研究提供了依据。     

Modeling and characterization of piezoelectric cantilever in fluids at different temperatures

This paper introduces measurement and modeling of a piezoelectric beam used as a sensor in different types of liquids. It is immersed in different fluids at temperatures increasing from 20 °C to 50 °C. The working principle is based on detecting different resonance frequencies of the cantilever in different solutions. The oscillation of piezoelectric beam is measured using a vector network analyzer. An electrical equivalent circuit derived from a resonator model is used to simulate the experimental data. These calculated circuit constants have been related to physical properties of liquids under test. The combination of these liquids which includes non-conducting and conducting solutions, exhibiting low and high viscosity covers a good range of common physical properties of fluids. Main focus of this research is to explore the capability of piezoelectric cantilever as a liquid sensor with the influence of temperature. The equivalent circuit model has been proved to be viable to fit experimental data in non-conducting solution but less effective in conducting solution.     

筒式液阻减振器的阻力特性及其发展状况

介绍了目前使用在车辆上的各种不同结构形式的减振器,分析了诸如橡胶、金属弹簧、电流变液和磁流变液、气体控制阻尼可调、干摩擦式阻尼可调等类减振器的结构特点、工作原理、适用场合及其优缺点;给出了双筒液压减振器的复原阻力与压缩阻力的计算方法,为液阻减振器的设计制造提供了理论基础;最后,分析了我国筒式液阻减振器技术的发展状况及其存在问题,展望了减振器技术的发展前景.     

简式液阻减震器的阻力特性及发展状况

本文介绍了目前使用在车辆上的各种不同形式结构的减震器,分析了橡胶减振器、金属弹簧减振器、电流变液和磁流变液减振器、气体控制阻尼可调减振器、干摩擦式阻尼可调减振器等的架构特点、工作原理、适用场合及其优缺点.给出了双筒液压减震器的复原阻力与压缩阻力的计算方法,为液阻减震器的设计制造提供了方便的理论基础.最后分析了我国筒式液阻减震器技术的发展状况及问题,展望了减震器技术的前景.     

A flow control device for incompressible fluids

This paper introduces a constant flow method for incompressible fluids using a mechanical choked orifice plate (MCOP), even when changes in differential pressure occur between the upstream and downstream. The MCOP is constructed by inserting a float-spring blockage into an ordinary orifice plate to imitate the function of a critical cavitating flow in a cavitating Venturi. A model MCOP is established and verified by numerical simulation, and a prototype MCOP is designed and tested by experiments. The results show that the numerical simulation is a good guide for the MCOP design. The designed MCOP can keep a constant flow with an error in the flow control of ±4% within the range of the differential pressure between the upstream and downstream of 6–70 kPa. Because the constant flow is obtained without fluid vapourization, the pressure loss is greatly reduced and the noise and erosion are avoided. Additionally, due to the action of the float-spring blockage being based on the differential pressure between upstream and downstream, it is simultaneously insensitive to both upstream and downstream pressure fluctuations. The design idea and the conclusions can be used as a reference in the design of a constant flow control device for incompressible fluids.     

Development of novel sustainable neat-oil metal working fluids for stainless steel and titanium alloy machining. Part 1. Formulation development

This paper introduces and describes the development and application of methodologies for the formulation of novel sustainable neat-oil metal removal fluids. A further paper will describe the methodologies being employed and the results of the performance benchmarking of the final fluid formulations for stainless steel and aerospace-grade titanium alloy materials. In this paper, a stepwise approach to the development of novel sustainable neat-oil metal removal formulations is described with a detailed discussion and analysis of the approach taken and the methodologies developed and applied. Two target applications were identified for cutting stainless steel and aerospace-grade titanium alloys. The key required properties of the fluids for these applications were combined with targets identified for cost, low temperature properties, kinetic viscosity (KV) and oxidative stability. Samples of base oils were obtained and characterised. The oils ranged from commodity commercial and specialist natural vegetable oils to chemically modified vegetable-oil-derived fatty acid esters and polyols. The selected oils were used to create blends which were screened for their key properties. From this work, four blends of base oils were identified for being taken forwards to the formulation screening stage. These blends represented a range of natural and modified oils blended in such a way as to achieve all of the required key properties of cost, KV, melt/pour points and oxidative stability. To determine if the oils were likely to also perform well as metal cutting fluids, they were subjected to a range of tests with and without the addition of certain additives, and their performances were benchmarked against a range of mineral oil and polyol-ester-based commercial fluids currently supplied to the target applications areas. The tests employed were: SRV, microtap and oxidation stability. The issues involved in the extrapolation of results from tribological testing to the prediction of fluid cutting performance are highlighted and discussed. From this work, one base oil blend for each of the two target applications was identified and the best performing mineral and polyol ester benchmark fluids were selected. Full-scale drilling and rigid torque tapping tests were used to refine formulations and to screen other additives identified in parallel microtap tests. The durability, oxidation stability, machine tool compatibility and misting potentials of the final formulations were also benchmarked using a range of standard and novel methodologies—this work will be described in a later paper.     

绿色水基切削液的技术经济分析

介绍了我国绿色水基切削液的发展概况、绿色水基切削液的概念和产品特性,分析了我国国内金属加工液的市场需求情况、使用传统切削液的不利因素和应用绿色水基切削液的技术经济,阐述了绿色水基切削液的标准规范.     

Environmentally adapted lubricants,Part II. Hydraulic fluids

Current technologies relating to hydraulic fluids are mostly either mineral based, synthetic based, or water‐based. Mineral oil based hydraulic fluids tend to be used for their excellent lubrication characteristics, economic viability, and so account for almost 90% of hydraulic fluids, while waterbased fluids tend to be employed in fire hazard applications. Synthetic hydraulic fluids possess superior properties to mineral oils, but their higher price limits their application to aerospace and special applications under severe conditions. In recent years, biodegradable hydraulic fluids, which are readily decomposed by micro‐organisms, have come into focus due to the rise in environmental consciousness in European countries, particularly Sweden and Germany, and with this, vegetable‐based fluids. In the present paper, the main categories of hydraulic fluids, including environmentally friendly fluids, are discussed in an overview of the state of technology in this area. Current governmental regulation, and the properties required of environmentally adapted fluids, and an appraisal of the current practices in various countries are also given. In an earlier paper*, the authors reviewed the key aspects of and requirements for environmentally adapted lubricants, namely, chemical composition, eco‐toxicity, biodegradability, bio‐accumulation, eco‐labelling schemes, and life‐cycle analysis. In the present paper, the main categories of hydraulic fluids, including environmentally friendly fluids, have been described. In Part I*, the authors reviewed the key aspects of and requirements for environmentally adapted lubricants.     

水的硬度对切削液性能的影响

论述了不同硬度的水对切削液稀释液的稳定性、消泡性、表面张力、pH值、防锈性和润滑性(pB、pD)等性能的影响.随着水的硬度增加,消泡加快,但稳定性变差.水的硬度对pH值和变面张力影响不明显,对单片防锈无影响,但叠片防锈效果随硬度增加而下降.对润滑性能的影响,因切削液组分不同而各异.