本质安全型电磁铁动静态特性测试系统研究
发布时间：2019-01-30 20:42
【摘要】：液压支架电液控制技术是综采装备关键技术之一。电液控制阀组是支架电液控制系统的核心组件。电磁铁的失效将导致电磁先导阀失灵，由此会对综采工作面的安全生产产生极大的危害。另一方面，液压支架控制系统的性能将决定煤矿生产效率，而本安型电磁铁是液压控制系统中关键的执行元件。所以对于本安型电磁铁动静态特性的试验研究是提高其可靠性及工作效率的必由之路。目前国内还没有专用的本安型电磁铁测试系统，为改变这一状况，提高本安型电磁铁研发与制造水平，设计一套本安型电磁铁动静态特性测试系统是非常必要的。 为了确定本测试系统的性能，本文首先采用分段磁路法对某型本安型电磁铁进行建模仿真，得到了电磁铁动态电流和动态位移特性的仿真曲线，并采用功率谱方法对电流频率特性进行分析，得到了其频率分布，为传感器选型提供参考。 本文提出以NI公司PXI-8108主机为上位机的本安型电磁铁特性测试系统，并以LabVIEW软件为测试软件开发环境。测试系统应用交流伺服运动控制台作为加载装置，并采用PXI-7344运动控制卡进行控制。 为与本安型电磁铁动静态特性相匹配，本测试系统选用平行梁式应变式力传感器、电涡流位移传感器和霍尔电流传感器。在电磁铁卡具和位移传感器安装座的机械结构设计中，不仅考虑了安装误差对测量准确性的影响，还设计了相应的触点结构，为保护测试台而提供必要的控制逻辑信号。 针对电磁铁静态特性测试过程中力传感器产生的变形，本文提出了基于二分法的补偿策略。针对加载过程中伺服运动台的扰动对力测试的影响，本文提出了在控制系统中采用陷波滤波技术对运动控制进行改进，以减少加载过程中力传感器信号振荡。 在本安型电磁铁动态特性测试方面，本文分别给出了瞬态电流响应和瞬态衔铁位移响应的测试方法。为减小动态特性测量中的负载效应，对电涡流感应测头结构进行了合理设计。并分析了电流测试中的系统误差。 本系统在实践中已被证明测试准确、操作方便，，达到了为本安型电磁铁提供动静态特性测试的目的。 本课题受到山西省科技重大专项（编号：20111101025）综采液压支架电液控制阀研发项目的支持。
[Abstract]:Hydraulic support electro-hydraulic control technology is one of the key technologies of fully mechanized mining equipment. The electrohydraulic control valve group is the core component of the electrohydraulic control system of the support. The failure of electromagnet will lead to the failure of electromagnetic pilot valve, which will cause great harm to the safety production of fully mechanized mining face. On the other hand, the performance of the hydraulic support control system will determine the coal mine production efficiency, and the intrinsically safe electromagnet is the key executive element in the hydraulic control system. So it is the only way to improve the reliability and working efficiency to study the dynamic and static characteristics of the safety electromagnet. At present, there is no special testing system for intra safe electromagnets in China. In order to change this situation and improve the level of R & D and manufacturing of intrinsically safe electromagnets, it is very necessary to design a test system for the dynamic and static characteristics of intra safe electromagnets. In order to determine the performance of the test system, this paper first uses the piecewise magnetic circuit method to model and simulate a certain type of intrinsically safe electromagnet, and obtains the simulation curves of the dynamic current and displacement characteristics of the electromagnet. The power spectrum method is used to analyze the current frequency characteristics, and the frequency distribution is obtained, which provides a reference for the sensor selection. In this paper, a testing system for the characteristics of NI's PXI-8108 host computer is proposed, and the LabVIEW software is used as the test software development environment. The AC servo motion console is used as the loading device and the PXI-7344 motion control card is used to control the test system. In order to match the dynamic and static characteristics of intrinsically safe electromagnets, parallel beam strain force sensors, eddy current displacement sensors and Hall current sensors are used in this test system. In the mechanical structure design of electromagnet clamping and displacement sensor mounting seat, not only the influence of installation error on measurement accuracy is considered, but also the corresponding contact structure is designed, which provides necessary control logic signals for protecting the test bench. Aiming at the deformation of force sensor in the process of testing the static characteristics of electromagnet, a compensation strategy based on dichotomy is proposed in this paper. Aiming at the effect of disturbance of servo motion platform on force measurement during loading, a notch filter technique is proposed to improve the motion control in order to reduce the vibration of force sensor signal during loading. In the aspect of measuring the dynamic characteristics of the intrinsically safe electromagnet, the methods of measuring the transient current response and the transient armature displacement response are given in this paper. In order to reduce the load effect in dynamic characteristic measurement, the structure of eddy current induction probe is designed reasonably. The systematic error in current measurement is also analyzed. The system has been proved to be accurate and easy to operate in practice. This subject is supported by the R & D project of electro-hydraulic control valve of fully mechanized mining hydraulic support (No.20111101025).
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD355.4
本文编号：2418493
[Abstract]:Hydraulic support electro-hydraulic control technology is one of the key technologies of fully mechanized mining equipment. The electrohydraulic control valve group is the core component of the electrohydraulic control system of the support. The failure of electromagnet will lead to the failure of electromagnetic pilot valve, which will cause great harm to the safety production of fully mechanized mining face. On the other hand, the performance of the hydraulic support control system will determine the coal mine production efficiency, and the intrinsically safe electromagnet is the key executive element in the hydraulic control system. So it is the only way to improve the reliability and working efficiency to study the dynamic and static characteristics of the safety electromagnet. At present, there is no special testing system for intra safe electromagnets in China. In order to change this situation and improve the level of R & D and manufacturing of intrinsically safe electromagnets, it is very necessary to design a test system for the dynamic and static characteristics of intra safe electromagnets. In order to determine the performance of the test system, this paper first uses the piecewise magnetic circuit method to model and simulate a certain type of intrinsically safe electromagnet, and obtains the simulation curves of the dynamic current and displacement characteristics of the electromagnet. The power spectrum method is used to analyze the current frequency characteristics, and the frequency distribution is obtained, which provides a reference for the sensor selection. In this paper, a testing system for the characteristics of NI's PXI-8108 host computer is proposed, and the LabVIEW software is used as the test software development environment. The AC servo motion console is used as the loading device and the PXI-7344 motion control card is used to control the test system. In order to match the dynamic and static characteristics of intrinsically safe electromagnets, parallel beam strain force sensors, eddy current displacement sensors and Hall current sensors are used in this test system. In the mechanical structure design of electromagnet clamping and displacement sensor mounting seat, not only the influence of installation error on measurement accuracy is considered, but also the corresponding contact structure is designed, which provides necessary control logic signals for protecting the test bench. Aiming at the deformation of force sensor in the process of testing the static characteristics of electromagnet, a compensation strategy based on dichotomy is proposed in this paper. Aiming at the effect of disturbance of servo motion platform on force measurement during loading, a notch filter technique is proposed to improve the motion control in order to reduce the vibration of force sensor signal during loading. In the aspect of measuring the dynamic characteristics of the intrinsically safe electromagnet, the methods of measuring the transient current response and the transient armature displacement response are given in this paper. In order to reduce the load effect in dynamic characteristic measurement, the structure of eddy current induction probe is designed reasonably. The systematic error in current measurement is also analyzed. The system has been proved to be accurate and easy to operate in practice. This subject is supported by the R & D project of electro-hydraulic control valve of fully mechanized mining hydraulic support (No.20111101025).
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD355.4
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