竖井罐笼提升系统安全设施的改造实践

针对竖井罐笼提升系统安全设施采用液压或气压驱动方式存在的初期投资大、运行费用高、安装改造周期长等问题,提出了新型驱动方式,即采用电液推杆作为阻车器及摇台的动力,采用减速电动机作为安全门的动力,对矿井提升系统安全设施进行改造,改造系统应用取得了良好的运行效果。     

GWDC to Become Domestically First-class and Internationally Advanced General Contractor in Petroleum Engineering Technology Market

正Status Greatwall Drilling Company(GWDC),an integrated petroleum engineering services company,mainly focuses on drilling,geophysical prospecting,logging,cementing as well as the development of oil well construction including top driving,mud.and well completion.It provides general contracting services of well construction for oilfield development.What's more.GWDC devotes major efforts to reservoir geological study,workover and lateral     

DSS系统与MV2-0 DGPS的联机和应用

DSS系统即地震数字化系统,是东方地球物理公司自主研发的一套集施工任务分配、质量监控、可控震源导航为一体的成套系统。DSS的技术优势在无线节点记录技术(GSR)项目尤为明显,可根据实际生产进度实时调整各组可控震源任务量,能够灵活地做好生产的协调与指挥;实时监控可控震源QC数据及搬点质量;直观而精确度高的导航功能。实现这些功能的最关键点在于DSS与DGPS的联机和应用。     

风力发电机组传动系统常见故障分析

介绍了国产1500型风力发电机组传动系统的结构、功能,针对风力机主要受力部件的常见故障进行原因分析。为风力发电机组安全可靠运行,减少故障发生率提供保证。     

双伺服新型数控冲齿机的设计

介绍一种以可编程控制器(PLC)作主控制器、伺服传动系统作执行驱动机构的新型两轴数控冲齿机.论述系统的工作原理、硬件实现及软件编程方法.新系统的冲齿-牵料机构彻底改变传统冲齿机的机械耦合连接方式,采用计算机数字控制和高精度伺服传动系统,实现机械解耦和数字化柔性连接,通过软件编程和人-机界面参数设置,保证两轴同步驱动和工艺参数的柔性化调整.     

并行LED驱动电路的多SITE测试方法

并行LED驱动电路的多SITE测试对系统资源和测试速度有较高要求,文章介绍了并行LED驱动电路的工作方式、常见测试参数以及常见参数的测试方法。探讨了在中测阶段进行多SITE测试的方法,对该类电路多SITE测试中的一些难点进行了分析,并提出了一种新的测试方案。该测试方案通过资源复用的方式,采用最新的切换技术,可以有效提高测试准确性,并提高测试效率,降低测试成本。最后介绍了多SITE测试的一些其他要点以及最终的测试结果。     

地理信息数据库的创建及其在物探生产中的应用

建立针对物探采集项目的地理数据库,用于测线设计、营地搬迁、震源导航无桩号施工、质量控制、数据统计分析、三维浏览和数据成果制图,是当今物探生产组织管理现代化的标志之一。本文着重介绍项目型地理信息数据库的建立方法,以及对道路、桥梁、农田、房屋、村镇、河流湖泊、油田设施、各种障碍物等地理信息结合卫星影像和高程模型的管理应用,快速精准地掌握施工队伍的工区概况、施工进度、测线部署和队伍状况等生产管理信息,为科学决策和指导生产提供科学依据。     

Pulse-driven LED circuit with transformer-based current balance technique

Light emitting diodes (LEDs) have been gradually used for backlight modules for liquid crystal display as a substitute for cold cathode fluorescent lamps. In most of LED applications, it is required to connect several LED strings in parallel to limit the dc voltage level to be applied to the single LED string. Due to considerable current variations through each LED string with inevitable parameter deviations as well as temperature and ageing effects, techniques to balance currents flowing through LED strings are required for LED drivers. This article proposes a pulse-driven LED circuit with transformer-based current balancing scheme, which can simply regulate currents through the LED strings. The transformers are placed in series with the LED strings in such a way that the LED currents are automatically balanced. Since the developed current sharing technique employs no dissipative resistors and no linear-mode transistors, the proposed driver has high efficiency, low power dissipation and reduced thermal problems. In addition, the presented driver with no additional semiconductor devices and no additional controllers can provide a simple and a cost-effective current balancing solution, compared to conventional approaches. Thus, the proposed LED driver can feature a simple, highly efficient, reliable and cost-effective method. The presented LED driver is verified with experimental results.     

Optimal design of a main driving mechanism for servo punch press based on performance atlases

The servomotor drive turret punch press is attracting more attentions and being developed more intensively due to the advantages of high speed,high accuracy,high flexibility,high productivity,low noise,cleaning and energy saving.To effectively improve the performance and lower the cost,it is necessary to develop new mechanisms and establish corresponding optimal design method with uniform performance indices.A new patented main driving mechanism and a new optimal design method are proposed.In the optimal design,the performance indices,i.e.,the local motion/force transmission indices ITI,OTI,good transmission workspace good transmission workspace(GTW) and the global transmission indices GTIs are defined.The non-dimensional normalization method is used to get all feasible solutions in dimensional synthesis.Thereafter,the performance atlases,which can present all possible design solutions,are depicted.As a result,the feasible solution of the mechanism with good motion/force transmission performance is obtained.And the solution can be flexibly adjusted by designer according to the practical design requirements.The proposed mechanism is original,and the presented design method provides a feasible solution to the optimal design of the main driving mechanism for servo punch press.     

轴承自动注油系统在直线振动筛上的应用

介绍了火铺矿选煤厂自行设计的轴承自动注油系统的结构组成及电气控制原理,并在直线振动筛上的应用实践情况。轴承自动注油系统在直线振动筛上的成功应用,解决了长期以来依靠人工注油导致的不良润滑效果、轴承故障率高以及使用寿命短等问题,从而取得了较好的经济实用效果。