【摘要】：本文圍繞自動(dòng)化機(jī)械實(shí)現(xiàn)高速分度的工程需求，提出一種新型的凸輪-連桿組合分度機(jī)構(gòu)。該機(jī)構(gòu)在輸入軸回轉(zhuǎn)一周過(guò)程中，輸出軸可實(shí)現(xiàn)多次分度；并且采用輸入、輸出同軸的五桿機(jī)構(gòu)與共軛凸輪封閉組合的結(jié)構(gòu)形式，使得該機(jī)構(gòu)具有結(jié)構(gòu)緊湊的特點(diǎn)，從而該類機(jī)構(gòu)具有廣闊的應(yīng)用前景。本文針對(duì)提出的新型分度機(jī)構(gòu)做了以下研究： 在分度機(jī)構(gòu)創(chuàng)新設(shè)計(jì)方面，基于顏氏機(jī)械裝置的創(chuàng)造性設(shè)計(jì)方法，以前接式凸輪連桿分度機(jī)構(gòu)為原機(jī)構(gòu)，分析了該類分度機(jī)構(gòu)的拓?fù)浣Y(jié)構(gòu)特點(diǎn)，構(gòu)造了該類分度機(jī)構(gòu)的一般化鏈圖譜，經(jīng)過(guò)特定化后得到了多種具有相同結(jié)構(gòu)形式的新構(gòu)型方案，為該類分度機(jī)構(gòu)的創(chuàng)新設(shè)計(jì)提供了借鑒。 在分度機(jī)構(gòu)尺度綜合方面，在系統(tǒng)分析了分度機(jī)構(gòu)結(jié)構(gòu)與傳動(dòng)原理的基礎(chǔ)上，建立了分度機(jī)構(gòu)的幾何特性及傳力特性約束方程；分析了機(jī)構(gòu)的結(jié)構(gòu)參數(shù)對(duì)幾何及傳力特性的影響規(guī)律；以傳力特性最優(yōu)為目標(biāo)，提出了該種機(jī)構(gòu)運(yùn)動(dòng)學(xué)設(shè)計(jì)的一般方法；建立了新型分度機(jī)構(gòu)的虛擬樣機(jī)模型，進(jìn)行了運(yùn)動(dòng)仿真，驗(yàn)證了新型分度機(jī)構(gòu)的有效性。 在運(yùn)動(dòng)學(xué)分析方面，，采用多剛體笛卡爾運(yùn)動(dòng)學(xué)分析方法，建立了新型分度機(jī)構(gòu)的運(yùn)動(dòng)學(xué)分析模型，得到了分度機(jī)構(gòu)位移、速度及加速度運(yùn)動(dòng)規(guī)律，為后續(xù)的動(dòng)力學(xué)分析奠定了基礎(chǔ)，并且運(yùn)動(dòng)學(xué)分析的方法可為同類機(jī)構(gòu)的運(yùn)動(dòng)學(xué)分析提供借鑒。 在動(dòng)力學(xué)分析方面，基于作用線增量法，建立了輸出軸轉(zhuǎn)角誤差與凸輪和滾子的運(yùn)動(dòng)副間隙的對(duì)應(yīng)關(guān)系，在此基礎(chǔ)上，采用“接觸-分離”兩狀態(tài)間隙模型，建立了考慮凸輪與滾子間隙的多剛體動(dòng)力學(xué)模型，得到了一個(gè)分度周期內(nèi)凸輪與滾子間作用力的變化規(guī)律，研究了當(dāng)選取不同凸輪運(yùn)動(dòng)規(guī)律時(shí)，接觸力的變化規(guī)律，此分析可為凸輪運(yùn)動(dòng)規(guī)律的選取提供依據(jù)。
[Abstract]:In this paper, a new type of cam-connecting rod combined indexing mechanism is proposed to meet the engineering requirements of automatic machinery to realize high speed indexing. The output shaft of the mechanism can be indexed several times during the rotation of the input shaft for one week. The structure form of the input and output coaxial five-bar mechanism combined with the conjugate cam is adopted, which makes the mechanism have the characteristics of compact structure, so this kind of mechanism has a broad application prospect. In this paper, the following research has been done on the new indexing mechanism: in the innovative design of indexing mechanism, based on the creative design method of Yan's mechanical device, the former connecting cam linkage indexing mechanism is the original mechanism. In this paper, the topological characteristics of this kind of indexing mechanism are analyzed, and the generalized chain diagram of this kind of indexing mechanism is constructed. After being specified, a variety of new configuration schemes with the same structural form are obtained. It provides a reference for the innovative design of this kind of indexing mechanism. In the aspect of scale synthesis of indexing mechanism, on the basis of systematically analyzing the structure and transmission principle of indexing mechanism, the constraint equations of geometric characteristic and force transfer characteristic of indexing mechanism are established. The influence of structural parameters on geometry and force transfer characteristics is analyzed, and a general method for kinematic design of the mechanism is proposed. The virtual prototype model of the new indexing mechanism is established and the motion simulation is carried out to verify the effectiveness of the new indexing mechanism. In kinematics analysis, the kinematics analysis model of a new indexing mechanism is established by using the multi-rigid Cartesian kinematics analysis method, and the displacement, velocity and acceleration of the indexing mechanism are obtained. The method of kinematics analysis can be used as a reference for kinematics analysis of similar mechanisms. In the aspect of dynamic analysis, based on the action line increment method, the corresponding relationship between the angular error of the output shaft and the clearance of the cam and roller is established. On the basis of this, the "contact-separation" two-state clearance model is adopted. The dynamic model of multi-rigid body considering the clearance between cam and roller is established, and the law of force variation between cam and roller in a indexing period is obtained, and the law of contact force is studied when different cam motion laws are selected. This analysis can provide the basis for the selection of cam motion law.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH122

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本文編號(hào)：2303724