摘 要
实现煤炭工业的安全、高效、集约化生产,对综采工作面生产装备的自动化程度的要求越来越高。电液换向阀是液压电液控制系统中的核心控制部件,其性能的优劣直接关系着整个综采工作面的安全和生产效率。为配合电液换向阀的研制和满足其高效的出厂或维修后性能试验,本文研制了一台高效率、高精度、智能化的电液换向阀性能测试试验台。本文主要进行了以下几个方面研究:
根据煤炭行业关于液压电液换向阀的试验标准,结合实际需要,确定了电液换向阀的试验内容、方法及要求指标,提出了试验台的性能要求,制定了试验台的总体设计方案。
对试验台测控系统的硬件部分做了详细设计,对工控机、传感器、数据采集卡等关键元件做了选型分析;设计了信号调理电路,包括:I/V转换电路和电脉冲信号衰减电路设计。设计了系统接口与执行元件间的驱动和隔离电路。分析了系统干扰的产生机理和类型,并对系统进行了抗干扰设计。
本文以LabVIEW软件为开发平台,采用模块化的设计思想,完成对虚拟仪器测控系统软件的 发与实现,完成了数据输入和输出、数据处理、数据存储与显示、试验报表生成及打印和人机界面设计等功能模块的设计。设计了多通道循环数据采集VI,实现对试验压力信号采集;详细分析对比计数器输入和模拟输入两种测量电压脉冲信号的方法,并制定了用计数器输入测量电压脉冲的方案;研究了应用剔出粗大误差、平均值滤波和LabVIEW自带滤波器进行数据处理的方法。采用面向对象的设计思想,进行虚拟仪器软面板设计,制定了虚拟仪器测控系统人机界面的设计方案。
最后,对试验台及其测控系统进行了试验验证,证明其满足要求。
关键词:电液换向阀,试验台,液压系统,虚拟仪器,测控系统
Abstract
To achieve the safety of coal industry, high efficiency, intensive production, production automation equipment requirements of fully mechanized mining face increasingly high. The electro-hydraulic valve control hydraulic control system is the core component of hydraulic power, its performance is directly related to the safety and efficiency of fully mechanized mining face. To cooperate with the development of electro hydraulic directional control valve and meet the efficient factory or repair after the performance test, this paper developed the characteristics of electro-hydraulic reversing valve test bench of a high efficiency, high accuracy and intelligent. This paper mainly studies the following aspects:
According to the coal industry of hydraulic electro-hydraulic valve test standard, combined with actual needs, determine the electrohydraulic valve test content, methods and requirements, and puts forward the requirements of performance test bench, formulate the overall design scheme of the test rig.
The test-bed control system hardware is designed in detail, of industrial control computer, sensors, data acquisition card and other key components do selection analysis; signal conditioning circuit is designed, including I / V conversion circuit and electric pulse signal attenuation circuit design. The drive and isolation circuit between the system interface and the executive component is designed. The mechanism and types of the system interference are analyzed, and the anti jamming Design of the system is carried out.
The by the software of LabVIEW as the development platform, adopts the idea of modular design, completion of the virtual instrument measurement and control system software development and implementation, completed the data input and output, data processing, data storage and display, test report generation and printing and the man-machine interface design, function module design. Multi channel data acquisition VI is designed, the test pressure signal acquisition; method of detailed analysis and comparison of counter input and analog input voltage of two kinds of measuring pulse signal, and to develop the counter input pulse voltage measurement scheme; to study the application of excised gross error, the average value filter and LabVIEW built-in filter for data processing method. Based on the idea of object-oriented design, virtual instrument soft panel design, set design of man-machine interface of virtual instrument measurement and control system.
Finally, the test bench and control system was tested and proved that it could meet the requirements.
key word:Electro hydraulic directional valve test bench hydraulic system
virtual instrument measurement and control system
目 录
