本文選題：非圓齒輪 + 針桿驅(qū)動機(jī)構(gòu)��； 參考：《浙江理工大學(xué)》2017年碩士論文

【摘要】：隨著人們對紡織品需求的發(fā)展,電腦繡花機(jī)效率和繡花效果的要求也不斷增長�，F(xiàn)在我國的繡花機(jī)行業(yè)也在蓬勃發(fā)展,但是大多數(shù)產(chǎn)品處于中低檔水平,沒有形成國際品牌。這種情況的出現(xiàn),主要是因為國內(nèi)的繡花機(jī)廠家的自主創(chuàng)新能力差。國內(nèi)電腦繡花機(jī)產(chǎn)家對于電腦繡花機(jī)核心機(jī)構(gòu)的研究(如針桿驅(qū)動機(jī)構(gòu))還處在測繪和仿制國外產(chǎn)品的階段,這不僅帶來侵權(quán)和難以出口到發(fā)達(dá)國家的問題,而且仿制后的繡花機(jī)很難達(dá)到理想的性能。因此研發(fā)具有自主知識產(chǎn)權(quán)的新型針桿驅(qū)動機(jī)構(gòu)對于提升國產(chǎn)電腦繡花機(jī)的技術(shù)水平具有一定的現(xiàn)實意義。本論文針對國內(nèi)某種高速繡花機(jī)頭工作時壓腳驅(qū)動塊和壓腳接觸過程中存在沖擊的問題,分析了電腦繡花機(jī)針桿驅(qū)動機(jī)構(gòu)與壓腳驅(qū)動機(jī)構(gòu)的運(yùn)動特性,提出并研究可減小壓腳驅(qū)動塊和壓腳之間的沖擊的非圓齒輪傳動的針桿驅(qū)動機(jī)構(gòu)。通過理論分析和試驗驗證的方式對新針桿驅(qū)動機(jī)構(gòu)進(jìn)行了運(yùn)動學(xué)特性的研究,并對機(jī)構(gòu)的桿長等設(shè)計參數(shù)用遺傳算法進(jìn)行優(yōu)化,得到更加平穩(wěn)變化的傳動比。本文主要的研究內(nèi)容和結(jié)果如下:1).對原有繡花機(jī)頭針桿驅(qū)動機(jī)構(gòu)與壓腳驅(qū)動機(jī)構(gòu)進(jìn)行運(yùn)動學(xué)研究,分析壓腳與壓腳驅(qū)動塊接觸時速度特性。在符合針桿行程要求和考慮接觸過程壓腳驅(qū)動塊速度的前提下,進(jìn)行針桿運(yùn)動運(yùn)動特性曲線的設(shè)計。提出一種利用非圓齒輪連桿組合傳動的新型針桿驅(qū)動機(jī)構(gòu)來實現(xiàn)壓腳和針桿的預(yù)定運(yùn)動特性,以達(dá)到消除或減弱沖擊的效果。2).建立新型針桿驅(qū)動機(jī)構(gòu)的反向計算模型,計算并獲得非圓齒輪的傳動比與節(jié)曲線。采用多項式函數(shù)進(jìn)行傳動比曲線拼接的方法消除逆向計算所得傳動比曲線的局部尖點現(xiàn)象。建立以非圓齒輪傳動比標(biāo)準(zhǔn)差為目標(biāo),以針桿機(jī)構(gòu)桿長、速度重合區(qū)間長度等為設(shè)計參數(shù),以機(jī)殼的尺寸限制為約束條件的優(yōu)化模型,并利用Matlab遺傳算法工具包,實現(xiàn)非圓齒輪節(jié)曲線圓度的優(yōu)化,通過優(yōu)化使傳動比標(biāo)準(zhǔn)差由0.432變?yōu)榱?0.2012。3).建立凸輪連桿驅(qū)動壓腳機(jī)構(gòu)的運(yùn)動學(xué)模型,依據(jù)壓腳位移特性曲線進(jìn)行了凸輪廓線計算。根據(jù)挑線桿的運(yùn)動要求確定凸輪連桿的挑線機(jī)構(gòu)的相關(guān)參數(shù)。并開展了壓腳機(jī)構(gòu)和挑線機(jī)構(gòu)的結(jié)構(gòu)設(shè)計。4).開展了機(jī)頭及針桿架上的整體部件的三維設(shè)計,利用虛擬樣機(jī)的仿真求得針桿驅(qū)動塊和壓腳驅(qū)動塊的運(yùn)動特性,符合原太的設(shè)計要求。最后進(jìn)行實物加工,將繡花機(jī)頭和針桿架安裝到實驗機(jī)架上。通過高速攝像技術(shù)進(jìn)行運(yùn)動拍攝,進(jìn)一步驗證了針桿驅(qū)動塊的運(yùn)動特性符合預(yù)定設(shè)計要求。
[Abstract]:With the development of the demand for textiles, the requirements of computer embroidery machine efficiency and embroidery effect are also increasing. Now our embroidery machine industry is also booming, but most of the products are in the middle and low level and do not form international brands. This situation is mainly due to the independent innovation of the domestic embroidery machine manufacturers. The domestic computer embroidery machine manufacturer's research on the core mechanism of the computer embroidery machine (such as needle rod driving mechanism) is still in the phase of Surveying and copying foreign products, which not only brings the problems of torts and difficult to export to the developed countries, but the embroidery machine after imitation is difficult to achieve the ideal performance. Therefore, the research and development has independent intellectual property rights. The new needle rod drive mechanism has a certain practical significance for improving the technical level of the domestic computer embroidery machine. In this paper, the problems of the impact during the contact process of the pressing pin and the pressing foot during the working of some high speed embroidery machine head in China are analyzed, and the motion characteristics of the needle drive mechanism of the computer embroidery machine and the driving mechanism of the pressing foot are analyzed. The needle rod drive mechanism of non circular gear drive which can reduce the impact between the pressing foot drive block and the press foot is studied and studied. The kinematic characteristics of the new needle rod drive mechanism are studied by theoretical analysis and test verification, and the design parameters such as the length of the mechanism are optimized by the genetic algorithm, and a more stable change is obtained. The main contents and results of this paper are as follows: 1) the kinematic study of the original needle rod drive mechanism of the original embroidery machine and the driving mechanism of the pressing foot is carried out to analyze the speed characteristics of the contact between the press foot and the pressing foot drive block. The design of the sex curve. A new type of needle rod driving mechanism with non circular gear connecting rod combined drive is proposed to realize the predetermined motion characteristics of the press foot and needle bar to achieve the effect of eliminating or weakening the impact.2). A new model of the reverse calculation of the new needle rod driving mechanism is established, and the transmission ratio and the joint curve of the non circular gear are calculated and obtained. In order to eliminate the local cusp phenomenon of the transmission ratio curve obtained by reverse calculation, the type function can eliminate the local cusp phenomenon of the transmission ratio curve obtained by reverse calculation. The optimization model is set up based on the standard deviation of the non circular gear transmission ratio, with the length of the needle bar mechanism, the length of the speed reclosing interval as the design parameters and the constraints of the shell size as the constraint condition, and the Matlab genetic calculation is used. The method toolkit is used to optimize the roundness of the non circular gear section curve. By optimizing the transmission ratio standard deviation from 0.432 to 0.2012.3), the kinematic model of the cam connecting rod driving pressure foot mechanism is established. The cam profile is calculated according to the curve of the displacement characteristic of the press foot. The structure design.4 of the press foot mechanism and the thread picking mechanism was carried out. The three-dimensional design of the integral parts on the head and the needle bar frame was carried out. The motion characteristics of the needle rod drive block and the pressing foot drive block were obtained by the simulation of the virtual prototype, which met the original design requirements. Finally, the embroidery machine head and the needle bar frame were installed. On the experimental rack, motion shooting by high-speed photography technology further verified that the motion characteristics of the needle bar drive block accord with the predetermined design requirements.

【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TS941.56

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