發(fā)布時間：2018-04-19 02:17

  本文選題：打結(jié)器 + 打結(jié)鉗嘴�。� 參考：《中國農(nóng)業(yè)大學》2015年碩士論文

【摘要】：秸稈作為一種重要的生物質(zhì)資源,對其進行高效利用逐步成為農(nóng)業(yè)和農(nóng)村社會經(jīng)濟可持續(xù)發(fā)展的必然要求。由于秸稈存在分散、結(jié)構疏松等特點,利用方草捆壓捆機進行壓縮處理,是破解其高效利用過程中難以儲運瓶頸的重要手段。打結(jié)器是壓捆機的關鍵核心部件,直接影響壓捆機成結(jié)效率和捆形質(zhì)量。本研究以D型單結(jié)打結(jié)器(RS3770)為研究對象,利用逆向重構技術,對其進行三維幾何模型重構及其重構關鍵面精度分析研究；基于重構打結(jié)器模型進行運動仿真研究,獲取打結(jié)過程中各機構運動特性和時序關系；基于張力傳感器、高速攝影以及同步技術,利用ANSYS軟件平臺對承載較大載荷的打結(jié)鉗嘴進行了受力分析研究。具體研究結(jié)論如下： (1)通過HandySCAN700TM型手持式三維激光掃描儀獲取了D型單結(jié)打結(jié)器(RS3770)所有部件的復雜曲面點云數(shù)據(jù)；基于逆向工程重構技術,借助CATIA逆向模塊,對打結(jié)器所有部件進行了三維幾何模型重構；對打結(jié)器重構部件的關鍵工作面精度進行了分析,結(jié)果發(fā)現(xiàn)機架軸孔、驅(qū)動齒盤內(nèi)齒和內(nèi)凸輪、打結(jié)鉗嘴下顎、錐齒輪面90%以上區(qū)域達到了精確等級以上,所有關鍵工作面均能滿足后期運動仿真要求。 (2)將D型打結(jié)器重構部件在Solidworks環(huán)境下裝配,通過自由拖動驅(qū)動齒盤、脫繩桿、打結(jié)鉗嘴、卡線輪等,發(fā)現(xiàn)不存在干涉現(xiàn)象,證明重構部件具有良好的裝配效果；開展了重構D型單結(jié)打結(jié)器的卡線輪分支、打結(jié)鉗嘴分支、脫繩桿分支三大傳動系統(tǒng)的自由度分析研究,發(fā)現(xiàn)上述3個分支在運動時自由度均為1,驅(qū)動齒盤能保證其具有確定的運動；當卡線輪分支和打結(jié)鉗嘴分支中的錐齒輪分別與驅(qū)動齒盤鎖止平面接觸時,其自由度均為-1,表明卡線輪分支和打結(jié)鉗嘴處于靜止狀態(tài)；基于逆向重構打結(jié)器進行運動仿真分析研究,獲得了卡線輪、打結(jié)鉗嘴、上顎、脫繩桿等部件角速度-時間和角位移-時間的運動特性,其各部件運動時序規(guī)律精確解析如下：卡線輪首先旋轉(zhuǎn),0.03s后打結(jié)鉗嘴開始轉(zhuǎn)動,0.06s后上顎開始張開,0.11s后脫繩桿開始擺動,0.12s后卡線輪、打結(jié)鉗嘴、打結(jié)鉗嘴同步停止運動,0.34s秒后脫繩桿停止運動。 (3)利用華德9YFQ-1.5系列壓捆機開展了秸稈捆扎試驗,創(chuàng)制了張力傳感、高速攝影以及同步控制的試驗方案,首次成功獲取了秸稈捆扎過程中捆繩張力數(shù)據(jù)和捆繩對打結(jié)鉗嘴的作用部位；研究構建了捆繩張力與捆繩對打結(jié)鉗嘴作用力轉(zhuǎn)換模型,結(jié)果顯示捆繩對上顎的正向壓力較大,達到了314.89N；通過上述所獲得的捆繩對打結(jié)鉗嘴作用力大小和作用位置,利用ANSYS對上顎進行相關有限元分析,得到上顎在捆繩張力最大時刻的應力-應變圖,發(fā)現(xiàn)上顎安裝滾子軸處出現(xiàn)應力集中,達到了755.52MPa,進而提出了兩種改進方案以減小應力集中、延長打結(jié)鉗嘴使用壽命。
[Abstract]:As an important biomass resource, the efficient utilization of straw has gradually become an inevitable requirement for the sustainable development of agriculture and rural social economy.Because the straw has the characteristics of dispersion and loose structure, it is an important means to solve the bottleneck of storage and transportation in the process of high efficiency utilization by using the baler to compress the straw.Knitting machine is the key component of the baler, which directly affects the binding efficiency and the quality of bundles.In this study, the D type single knot knotting machine RS3770 is used as the research object, the 3D geometric model reconstruction and its key surface precision analysis are studied by using reverse reconstruction technology, and the kinematics simulation research based on the reconstructed knotting device model is carried out.Based on the tension sensor, high-speed photography and synchronization technology, the force analysis of the knots loaded with a large load was carried out by using ANSYS software platform.The specific findings of the study are as follows:HandySCAN700TM handheld 3D laser scanner is used to obtain the point cloud data of complex curved surface of all components of D type single knot knotter RS3770. Based on reverse engineering reconstruction technology, CATIA reverse module is used.The 3D geometric model reconstruction of all the parts of the knotter is carried out, and the precision of the key working face of the reconstructed part of the knotting apparatus is analyzed. The results show that the shaft hole of the rack drives the inner teeth and inner cam of the tooth disk, and the jaw of the knotted pliers.More than 90% of the bevel gear face has reached the accuracy level, and all the key working faces can meet the requirements of the later stage motion simulation.(2) assembling the reconstruction parts of D type knots in the Solidworks environment, by freely driving the tooth disc, the detaching rod, the knotting pliers, the clamping wheels, etc., it is found that there is no interference phenomenon, and it is proved that the reconstructed parts have good assembly effect.The degrees of freedom of three transmission systems, namely, clamping wheel branch, knotting clamp branch, and detaching rod branch, are analyzed and studied in this paper.It is found that the above three branches have a degree of freedom of 1 when moving, and the drive disk can guarantee its definite motion, and when the bevel gears in the branch of the clamping wheel and the clamping clamping mouth are in contact with the locking plane of the drive disk,The degree of freedom is -1, which indicates that the clamping wheel branch and the knotted tongs are in a static state, and the kinematic simulation analysis based on the reverse reconfiguration knotting device is carried out, and the clamping wheel, knot tongs and jaws are obtained.The kinematic characteristics of angular velocities, angular displacements and time of detaching rod and other components,The timing rules of motion of each component are as follows: the clamping wheel first rotates 0.03s, then the knotted tongs start to rotate 0.06s, then the upper jaw starts to open 0.11s, then the detaching rod begins to swing 0.12s after the clamping wheel, and the knotted pliers,The knotted tongs stop synchronously for 0.34 seconds and then the rope rod stops moving.(3) the strapping test was carried out with Ward 9YFQ-1.5 series strapping machine, and the test scheme of tension sensing, high speed photography and synchronous control was developed.For the first time, the data of rope tension in strapping process and the action position of tie rope on knots were obtained successfully, and the model of the force conversion between cord tension and tie rope on knot tongs was constructed. The results showed that the forward pressure of tie rope on jaw was high.Through the above obtained force and position of the binding rope to the knotted forceps, the relative finite element analysis of the upper jaw is carried out by using ANSYS, and the stress-strain diagram of the upper jaw at the maximum tension of the cord is obtained.It is found that the stress concentration appears at the axis of the jaw roller, reaching 755.52 MPa, and two improved schemes are proposed to reduce the stress concentration and prolong the service life of the knotted tongs.
【學位授予單位】：中國農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S817.11

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