發(fā)布時(shí)間：2019-01-30 20:42

【摘要】：液壓支架電液控制技術(shù)是綜采裝備關(guān)鍵技術(shù)之一。電液控制閥組是支架電液控制系統(tǒng)的核心組件。電磁鐵的失效將導(dǎo)致電磁先導(dǎo)閥失靈，由此會(huì)對(duì)綜采工作面的安全生產(chǎn)產(chǎn)生極大的危害。另一方面，液壓支架控制系統(tǒng)的性能將決定煤礦生產(chǎn)效率，而本安型電磁鐵是液壓控制系統(tǒng)中關(guān)鍵的執(zhí)行元件。所以對(duì)于本安型電磁鐵動(dòng)靜態(tài)特性的試驗(yàn)研究是提高其可靠性及工作效率的必由之路。目前國(guó)內(nèi)還沒(méi)有專用的本安型電磁鐵測(cè)試系統(tǒng)，為改變這一狀況，提高本安型電磁鐵研發(fā)與制造水平，設(shè)計(jì)一套本安型電磁鐵動(dòng)靜態(tài)特性測(cè)試系統(tǒng)是非常必要的。 為了確定本測(cè)試系統(tǒng)的性能，本文首先采用分段磁路法對(duì)某型本安型電磁鐵進(jìn)行建模仿真，得到了電磁鐵動(dòng)態(tài)電流和動(dòng)態(tài)位移特性的仿真曲線，并采用功率譜方法對(duì)電流頻率特性進(jìn)行分析，得到了其頻率分布，為傳感器選型提供參考。 本文提出以NI公司PXI-8108主機(jī)為上位機(jī)的本安型電磁鐵特性測(cè)試系統(tǒng)，并以LabVIEW軟件為測(cè)試軟件開發(fā)環(huán)境。測(cè)試系統(tǒng)應(yīng)用交流伺服運(yùn)動(dòng)控制臺(tái)作為加載裝置，并采用PXI-7344運(yùn)動(dòng)控制卡進(jìn)行控制。 為與本安型電磁鐵動(dòng)靜態(tài)特性相匹配，本測(cè)試系統(tǒng)選用平行梁式應(yīng)變式力傳感器、電渦流位移傳感器和霍爾電流傳感器。在電磁鐵卡具和位移傳感器安裝座的機(jī)械結(jié)構(gòu)設(shè)計(jì)中，不僅考慮了安裝誤差對(duì)測(cè)量準(zhǔn)確性的影響，還設(shè)計(jì)了相應(yīng)的觸點(diǎn)結(jié)構(gòu)，為保護(hù)測(cè)試臺(tái)而提供必要的控制邏輯信號(hào)。 針對(duì)電磁鐵靜態(tài)特性測(cè)試過(guò)程中力傳感器產(chǎn)生的變形，本文提出了基于二分法的補(bǔ)償策略。針對(duì)加載過(guò)程中伺服運(yùn)動(dòng)臺(tái)的擾動(dòng)對(duì)力測(cè)試的影響，本文提出了在控制系統(tǒng)中采用陷波濾波技術(shù)對(duì)運(yùn)動(dòng)控制進(jìn)行改進(jìn)，以減少加載過(guò)程中力傳感器信號(hào)振蕩。 在本安型電磁鐵動(dòng)態(tài)特性測(cè)試方面，本文分別給出了瞬態(tài)電流響應(yīng)和瞬態(tài)銜鐵位移響應(yīng)的測(cè)試方法。為減小動(dòng)態(tài)特性測(cè)量中的負(fù)載效應(yīng)，對(duì)電渦流感應(yīng)測(cè)頭結(jié)構(gòu)進(jìn)行了合理設(shè)計(jì)。并分析了電流測(cè)試中的系統(tǒng)誤差。 本系統(tǒng)在實(shí)踐中已被證明測(cè)試準(zhǔn)確、操作方便，，達(dá)到了為本安型電磁鐵提供動(dòng)靜態(tài)特性測(cè)試的目的。 本課題受到山西省科技重大專項(xiàng)（編號(hào)：20111101025）綜采液壓支架電液控制閥研發(fā)項(xiàng)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).
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD355.4

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