茶叶理条机理研究及加工设备参数优化

针对目前茶叶理条机存在的理条机理条效率低、理条效果差以及理条不稳定等问题,对茶叶颗粒在理条机锅槽内的运动和受力情况开展了研究,提出了茶叶颗粒在锅槽内运动的动力学理论模型,利用ADAMS对茶叶颗粒理条过程进行了模拟仿真试验,分析了茶叶颗粒理条过程中锅槽振动频率、锅槽振幅和锅槽挡板角度对茶叶理条效果的影响,在试验结果基础上对锅槽形状参数和运动参数进行了优化。研究结果表明,锅槽挡板角度对茶叶颗粒沿着锅槽内壁的运动时间有较大影响,锅槽振动频率和振幅对单位周期内摩擦力对茶叶颗粒做功和茶叶颗粒落入锅槽位置有较大影响,参数优化后的茶叶理条机能有效提高理条效率和质量。     

基于ANSYS的电压力锅锅体有限元分析与结构优化设计

电压力锅是如今广泛使用的电热炊具,利用Ansys软件对电压力锅锅体进行有限元分析。首先根据电压力锅工作的实际情况,采用顺序耦合法对电压力锅锅体进行热-应力耦合分析,得到锅体的应力分布情况,得出计算模型能够满足电压力锅工作安全的需要;再从节省材料使用的角度考虑,采用Ansys软件,以锅体的锅底厚度T1、锅壁厚度T2、牙口厚度T3为设计变量,锅体材料的疲劳强度极限σ为状态变量,对锅体结构进行优化,使锅体在能够达到工作安全要求的同时又能节省材料的使用。     

提拉杆式酿酒甑锅底锅阀的设计与应用

白酒传统酿造蒸馏过程中多采用间歇式甑锅,在排出底锅内废水时需使用底锅阀帮助其打开底锅排水管道,传统底锅阀因需要手动旋转操作而存在工人被烫伤的隐患。针对上述问题,分析与探讨了一种提拉杆式酿酒甑锅底锅阀,该装置包括第一法兰、第二法兰、第三法兰、阀芯以及辅助工具两角叉等部分。该提拉杆式底锅阀的提拉设计,便于操作,提高工作效率;同时,利用杠杆原理工人可使用两角叉将底锅阀的拉杆拉起或推下,既节省人力,又消除被蒸汽烫伤的安全隐患,该底锅阀的整体结构简单,实用价值较高。     

巧用常规设备辅助模具开发

正工件的数据测量,是产品设计开发及其模具的生产制作乃至产品最终检验中必不可少的环节。测量工具的合理使用很重要,而常规的加工设备非常规地用于测量,往往会使测量更快、更精准。下面以某款高档不锈钢锅的开发为例,简述电火花机在测量上的应用。锅主体与侧耳(业内将锅左右对称的把手称为侧耳)用铆钉紧固,因此侧耳的贴锅面与锅主体侧壁的贴合度直接影响了产品的牢固性与美观性。理想状况下,锅侧壁     

缝隙挡板在低压锅筒中的应用

以水泥窑余热锅炉发电项目中设计的锅筒为例,对低压锅筒使用缝隙挡板的实用性进行分析论述,为同类的锅筒设计和制造提供了参考实例.     

基于电阻应变式传感器的可称重烹饪器具内锅设计

在内锅提手的内锅上增加电阻应变式传感器,通过人手提起手柄的动作识别锅内米和水的重量,从而给出米水量配比是否正确的提示,同时可以作为厨房电子秤使用。主要介绍可行的可称重内锅应用方案。     

DZG型锅筒底部特殊腐蚀失效事故的原因分析

对锅筒底部大面积腐蚀产生原因进行分析,确定为加入酸性“锅炉专用高效力除垢剂”后,造成锅水总碱度和pH值严重偏小,锅内金属表面保护膜被破坏,引发锅筒底部高温区域产生大面积点坑状腐蚀。锅炉在运行期间锅内加酸性除垢剂处理方法应引起锅炉监督管理机构和检验部门的关注。     

表面织构技术在锌锅辊系滑动轴承中的应用

认识到锌锅辊系滑动轴承对锌锅的影响和对带钢产品质量带来的影响,通过了解表面织构技术在生产中的实际应用,在锌锅辊系滑动轴承轴套上开螺纹处理,通过实验验证锌锅辊系滑动轴承开螺纹表面织构能达到减小摩擦的作用。     

铝电解电容器含浸锅的设计研究

针对国内铝电解电容器生产设备存在的问题,依据新的含浸方法以及工艺要求,设计了一种含浸锅结构。简述了铝电解电容器的含浸方法和工艺流程,重点分析了该含浸锅的结构特点和工作原理。同时运用有限元分析软件,仿真得到了含浸锅的应力和应变分布图。最后,对含浸锅结构进行了优化。研究结果表明,该含浸锅结构能够实现连线生产,同时也能够可靠含浸,不污染导针和设备,提高了电容器的品质。     

浅析一种恒压装置在不锈钢锅具砂光上的应用

阐述一种在锅具全自动砂光机中应用的恒压装置,利用伺服电机、滚珠丝杆、气缸作为驱动装置,机器在对不锈钢锅具进行表面砂光时压力不以锅具形状而改变,产品纹路均匀细腻。     

CURING PROCESS OF PHOTOPOLYMER RESIN BOND DIAMOND TOOLS

Analytical simulation and corresponding proof-test are adopted to study the principle of the curing process of photopolymer resin diamond tools. The influence of the diamond as abrasives in photopolymer resin owing to the absorptivity of the diamond for the UV light on the photopolymer resin curing process is discussed. Based on the above, a kind of diamond tool—dicing blade is selected to analyze the curing process of photopolymer bond diamond tools. An analytical model of curing process is developed and a correlation curve between the depth of polymerization of the photopolymer resin diamond tools and the exposure time to represent the curing process of photopolymer bond dicing blade. A test is done to proof-test the validity of the analytical model and the correlation curve. The simulated data fit the experimental results, which demonstrates the analytical models and numerical algorithm are of high reliability. The analytical simulation method could possibly be used to optimize the curing cycle and improve the quality of the photopolymers resin bond diamond tools.     

Effects of prebuckling deformations on the elastic flexural-torsional buckling of laterally fixed arches

The effect of the prebuckling in-plane deformations on the elastic flexural-torsional buckling of laterally fixed circular arches is studied in this paper. The finite strains and the energy equation for the flexural-torsional buckling of arches have been derived based on an accurate orthogonal rotation matrix. A closed form solution for the elastic flexural-torsional buckling resistance of laterally fixed arches in uniform bending, including the effects of the prebuckling deformations, is obtained. It is found that the notion that the prebuckling deformations increase the flexural-torsional buckling moment of an arch or of a beam is not necessarily correct for a laterally fixed arch or beam in uniform bending, in deference to a laterally pinned arch. When a laterally fixed arch is subjected to positive uniform bending, the effects of the prebuckling deformations decrease the buckling moment, and the reduction of the buckling moment increases with an increase of the included angle and of the out-of-plane slenderness ratio of the arch. When a laterally fixed arch is subjected to negative uniform bending, the effects of the prebuckling deformations decrease the absolute value of its buckling moment when the included angle is very small, but increase the absolute value of the buckling moment when the included angle exceeds a certain value. The increase in the absolute value of the buckling moment increases with an increase of the included angle and of the out-of-plane slenderness ratio of the arch. When the ratio of the out-of-plane to the in-plane second moments of area of the cross-section is not small, both the reduction of the buckling moment of a laterally fixed arch in positive uniform bending and the increase of the buckling moment of a laterally fixed arch in negative uniform bending, are substantial.     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

滚筒采煤机负载的波动性分析

为了寻求滚筒采煤机正常工作时自身产生振动与冲击的原因,经过对滚筒上截齿受到的截割阻力与牵引阻力以及该两力在采煤机的牵引方向和竖直方向分力进行分析,得知两分力大小与截齿的切削厚度和旋转角度位置有关;研究了滚筒上受到的瞬时力与平均力的计算方法,推导了综合旋转角度和切削厚度的载荷波动系数的计算公式,并对所建立的公式进行了仿真模拟。结果表明:截齿数目从偶数增加1变为奇数时,载荷的波动系数的值明显减小;截齿从奇数增加1变为偶数时,载荷的波动系数不一定减小;适量的增加滚筒上同一螺旋线上截齿的数目可以有效的减小载荷的波动系数;为了提高截齿的使用寿命和可靠性以及滚筒的稳定性,减小滚筒和整个采煤机的冲击性,同一螺旋线上一周内截齿的数目应该尽量选用奇数。     

DIAGNOSTICS OF FATIGUE CRACK IN ULTERIOR PLACES OF LARGER-SCALE OVERLOADED SUPPORTING SHAFT BASED ON TIME SERIES AND NEURAL NETWORKS

To improve the diagnosis accuracy and self-adaptability of fatigue crack in ulterior place of the supporting shaft, time series and neural network are attempted to be applied in research on diag-nosing the fatigue crack’s degree based on analyzing the vibration characteristics of the supporting shaft. By analyzing the characteristic parameter which is easy to be detected from the supporting shaft’s exterior, the time series model parameter which is hypersensitive to the situation of fatigue crack in ulterior place of the supporting shaft is the target input of neural network, and the fatigue crack’s degree value of supporting shaft is the output. The BP network model can be built and net-work can be trained after the structural parameters of network are selected. Furthermore, choosing the other two different group data can test the network. The test result will verify the validity of the BP network model. The result of experiment shows that the method of time series and neural network are effective to diagnose the occurrence and the development of the fatigue crack’s degree in ulterior place of the supporting shaft.     

浅议机械论世界观主导地位之确立

占现代人类主导思想地位的机械论世界观,它的统治地位的确立是一个循序渐进的过程,先后经历了机械论大门的开启者培根,机械论世界观的架构者笛卡尔,机械论世界观主导地位确立和宣扬者牛顿,以及机械论世界观的社会意识形态补充者洛克,机械论世界观的经济意识形态的确立者斯密,再加上机械论世界观进步思想的巩固者达尔文等在各自不同领域的不懈探索和大力倡导,再加上其它意识形态领域潜移默化地影响而逐步得以确立。     

车门静态强度的有限元分析模拟

轿车门系统结构设计与优化是整车开发过程中的重要环节。车门的强度直接关系到整车在冲击、碰撞等载荷下的安全问题,车门结构静态强度的计算分析,在车门结构设计进程中非常重要。文中首先简要介绍了静态强度所涉及到的非线性有限元的基本理论,然后以某中高级轿车前车门为例,利用计算机辅助分析车门的静态强度,考虑变形的非线性因素,通过对车门的非线性有限元求解来分析车门强度,由计算所得到的车门强度性能指标来指导车门的结构设计。     

EFFECTS OF LEAD WIDTHS AND PITCHES ON RELIABILITY OF QUAD FLAT PACKAGE （QFP）SOLDERED JOINTS

The finite element method(FEM)is used to analyze the effects of lead widths and pitches on reliability of soldered joints.The optimum simulation for QFP devices is also researched.The results indicate that when the lead pitches are the same,the maximum equivalent stress of the soldered joints increases with the increasing of lead widths,while the reliability of the soldered joints reduces. When the lead widths are the same,the maximum equivalent stress of the soldered joints doesn't decrease completely with the increasing of lead pitches,a minimum value of the maximum equivalent stress values exists in all the curves.Under this condition the maximum equivalent stress of the sol- dered joints is relatively the least,the reliability of soldered joints is high and the assembly is excel- lent.The simulating results indicate the best parameter:The lead width is 0.2 mm and lead pitch is 0.3 mm(the distance between two leads is 0.1 mm),which are benefited for the micromation of QFP devices now.The minimum value of the maximum equivalent stress of soldered joints exists while lead width is 0.25 mm and lead pitch is 0.35 mm(the distance between two leads is 0.1mm),the devices can serve for a long time and the reliability is the highest,the assembly is excellent.The simulating results also indicate the fact that the lead width is 0.15 mm and lead pitch is 0.2 mm maybe the limit of QFP,which is significant for the high lead count and micromation of assembly.     

XML处理装备易损性仿真中毁伤树问题的应用

利用了XML数据结构的特点,很好地解决了装备易损性仿真中关于毁伤树的描述、读取和处理的问题.