本文關(guān)鍵詞： 高速磁懸浮驅(qū)動(dòng)織針系統(tǒng) 運(yùn)動(dòng)穩(wěn)定性 電磁耦合 紗線張力模型 針織提花圓機(jī)　出處：《武漢紡織大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：針對(duì)傳統(tǒng)機(jī)械式選針方式的低效率、高沖擊和摩擦等問題,本課題組提出以新型磁懸浮驅(qū)動(dòng)織針原理代替?zhèn)鹘y(tǒng)機(jī)械式選針驅(qū)動(dòng)方式,通過“以電代機(jī)”,實(shí)現(xiàn)織針的磁懸浮直接驅(qū)動(dòng),從原理上提高針織機(jī)械的編織效率和性能指標(biāo)。根據(jù)新型磁懸浮選針原理,本課題組初期嘗試采用普通圓柱密繞線圈和永磁體的組合結(jié)構(gòu),通過兩者間磁相互作用來實(shí)現(xiàn)選針。但經(jīng)過前期研究發(fā)現(xiàn),圓柱線圈的磁場(chǎng)由于隨織針懸浮位移的增大而大幅衰減,使得織針在懸浮過程中的受力變化較大,不僅無法保證在全部行程范圍為織針提供足夠的電磁驅(qū)動(dòng)力,也不利于織針的穩(wěn)定懸浮。為此,本課題組提出了一種大行程、大推力、由雙曲線型線圈和永磁體構(gòu)成的新型磁力驅(qū)動(dòng)結(jié)構(gòu)。在此基礎(chǔ)上,本文重點(diǎn)研究了該結(jié)構(gòu)的電磁驅(qū)動(dòng)理論模型,分析了織針懸浮運(yùn)動(dòng)過程中紗線張力、磁力及磁耦合等因素對(duì)織針運(yùn)動(dòng)穩(wěn)定性的影響,主要研究?jī)?nèi)容包括:(1)探討針織提花圓瑋機(jī)在編織時(shí)紗線張力對(duì)織針運(yùn)動(dòng)時(shí)的穩(wěn)定性影響,建立了紗線張力理論模型,通過理論計(jì)算、ANSYS仿真和實(shí)驗(yàn),驗(yàn)證了彎紗理論模型的正確性,得到了紗線張力對(duì)織針運(yùn)動(dòng)的影響規(guī)律。(2)研究磁懸浮系統(tǒng)的磁力驅(qū)動(dòng)部分,分析了新型驅(qū)動(dòng)線圈的磁場(chǎng)分布特性,基于織針運(yùn)動(dòng)穩(wěn)定性的要求研究了新型磁力驅(qū)動(dòng)結(jié)構(gòu)的磁力特性與規(guī)律,通過ANSYS仿真得到,軸向同軸布置、軸向間距為2mm的雙級(jí)新型雙曲線圈能夠?qū)崿F(xiàn)選針動(dòng)作,將重約2.6g的織針和永磁體懸浮起來,并且使其在懸浮過程受力較為平穩(wěn),織針在工作位移高度的電磁力波動(dòng)在5%左右。(3)研究磁懸浮織針系統(tǒng)中相鄰織針的磁力耦合問題,利用ANSYS磁場(chǎng)仿真,能夠?qū)崟r(shí)觀察到每一時(shí)間子步的針筒間的耦合效應(yīng),經(jīng)過多次修改相鄰針筒的軸向和徑向間距,得到了不同的耦合結(jié)果云圖及電磁力波動(dòng)值,為磁懸浮織針針筒結(jié)構(gòu)的優(yōu)化設(shè)計(jì)提供依據(jù)和參考。(4)實(shí)際制作磁懸浮樣機(jī)模型,實(shí)驗(yàn)結(jié)果表明,該新型磁力驅(qū)動(dòng)可滿足5英寸樣機(jī)288針的針織提花圓緯機(jī)的編織工藝要求,織針實(shí)際工作過程中的電磁力波動(dòng)范圍控制在9.7%以內(nèi)。綜上,本文將樣機(jī)實(shí)驗(yàn)與理論分析的結(jié)果進(jìn)行對(duì)比,驗(yàn)證了磁懸浮驅(qū)動(dòng)織針原理及方案的可行性。
[Abstract]:Aiming at the problems of low efficiency, high impact and friction in the traditional mechanical needle selection, our group proposed to replace the traditional mechanical needle selection drive with the new magnetic levitation driving needle principle. In order to improve the knitting efficiency and performance of knitting machinery, the magnetic levitation direct drive of knitting needle is realized. At the beginning of this research group, we try to adopt the combination structure of ordinary cylindrical coils and permanent magnets, and select needles through the magnetic interaction between them. The magnetic field of the cylindrical coil decreases greatly with the increase of the needle suspension displacement, which makes the force of the needle in the suspension process change greatly, not only can not guarantee enough electromagnetic driving force for the needle in the whole travel range. For this reason, a new type of magnetic drive structure, which is composed of hyperbolic coils and permanent magnets, has been proposed by our team, which is composed of hyperbolic coils and permanent magnets. In this paper, the electromagnetic driving theory model of this structure is studied, and the influence of yarn tension, magnetic force and magnetic coupling on the stability of needle motion is analyzed. The main research contents include: (1) to discuss the influence of yarn tension on the stability of knitting needle when knitting, the theoretical model of yarn tension is established, and the theoretical calculation is carried out. ANSYS simulation and experiment verify the correctness of the theoretical model of curved yarn. The influence of yarn tension on needle motion is obtained. (2) the magnetic driving part of magnetic levitation system is studied. The magnetic field distribution characteristics of the new drive coil are analyzed. Based on the requirements of needle motion stability, the magnetic force characteristics and laws of the new magnetic drive structure are studied. The axial coaxial arrangement is obtained by ANSYS simulation. A new double-stage hyperbolic ring with an axial spacing of 2 mm can be used to select the needle, which suspends the needle and permanent magnet weighing about 2.6 g, and makes it more stable in the process of suspension. The electromagnetic force fluctuation of the needle at the working displacement height is about 5%.) the magnetic coupling problem of the adjacent needles in the maglev needle system is studied, and the ANSYS magnetic field simulation is used. The coupling effect of each time sub-step can be observed in real time. By modifying the axial and radial spacing of adjacent syringe several times, different coupling result cloud diagram and electromagnetic force fluctuation value are obtained. It provides the basis and reference for the optimum design of the structure of the maglev knitting needle. 4) the model of the maglev prototype is made. The experimental results show that the model can be used in the design of the maglev prototype. The new magnetic force drive can meet the knitting technology requirements of the 288-pin knitting circular weft knitting machine with a 5-inch prototype. The electromagnetic force fluctuation range in the actual working process of the knitting needle is controlled within 9.7%. In this paper, the experimental results of the prototype are compared with the results of theoretical analysis, and the feasibility of the principle and scheme of the maglev driven knitting needle is verified.
【學(xué)位授予單位】：武漢紡織大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TS183.92

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