机械5

具有4-20MA远传信号的液位计设计 摘要：在现代制造业中，油位计在各种非标准自动化设备中的应用极为广泛，基本上安装在封闭的油箱上用来测量油液位的液位高度值，其通过内部结构将液位高度的实时变化值传动至外置指针表盘，以供使用者观测。传统的油液位测量仪在设计中难免存在不足之处，比如结构较为复杂且实现的功能很少，尤其不能进行实时信号的远距离传输，精度方面更是达不到应有的要求。本所设计的油液位测量仪，充分考虑了我国现阶段机械行业普遍制造工艺现状及代加工工厂的实际设备情况，为此设计了一套具有远传信号的YZF型油液位测量仪，在满足传统油液位测量仪的基础上，增添了新的功能，尤其在结构方面，进行了大幅度优化，更好地安排内置零件的空间分布位置，并且尽最大可能满足制造精度要求，以实现更高精度的远传信号。 采用依靠计算机辅助设计软件UG及Auto-CAD进行三维设计和二维工程图绘制，在UG软件按照自顶向下的设计理念进行结构设计的方法，在设计的整个过程中，通过在满足加工工艺要求的同时，也在零件的特殊位置施加曲面设计以更好地满足人的视觉需要，当然考虑了研发制造成本，在零件材料的选取上，尽可能在材料满足耐磨耐腐蚀的基础上选择较便宜的材质。同时对于齿轮的传动精度方面，在工程图中有所注明，即加工要求较高的手段，得出了所设计的油液位测量计能满足弥补市面上现存产品的不足之处，取长补短以更好的适应设备得的实际需求的结果和重要的结论。 关键词：液位计；UG;Auto-CAD Desig
n of liquid level meterwith 4-20mA remote sig
nal Abstract: I
n moder
n ma
nufacturi
ng, the oil level meter iswidely used i
n all ki
nds of
no
n-sta
ndard automatio
n equipme
nt. It is basically i
nstalled i
n closed oil ta
nk to measure the level of liquid level of oil level. It drives the real time cha
ngevalue of the level height to the exter
nal poi
nter dial through the i
nter
nal structure for the user to observe. The traditio
nal oil level measuri
ng i
nstrume
nt is difficult to avoid i
n the desig
n, such as the complex structure a
nd few fu
nctio
ns, especially the lo
ng dista
nce tra
nsmissio
n of real time sig
nal. The oil level measuri
ng i
nstrume
nt desig
ned i
n this paper fully co
nsiders the curre
nt situatio
n of the ge
neral ma
nufacturi
ng process i
n our machi
nery i
ndustry a
nd the actual equipme
nt of the processi
ng pla
nt i
n our cou
ntry. A set of YZF type oil level measuri
ng i
nstrume
ntwith lo
ng tra
nsmissio
n sig
nal is desig
ned,which has added
new fu
nctio
ns, especially o
n the basis of the traditio
nal oil level measuri
ng i
nstrume
nt. I
n the aspect of structure, a large scale optimizatio
n is carried out to better arra
nge the spatial distributio
n of the built-i
n parts, a
nd to meet the requireme
nts of the ma
nufacturi
ng precisio
n as much as possible to achieve a higher precisio
n remote tra
nsmissio
n sig
nal. The paper adopts the computer aided desig
n software UG a
nd Auto-CAD for three-dime
nsio
nal desig
n a
nd drawi
ng of two-dime
nsio
nal e
ngi
neeri
ng drawi
ngs. I
n the UG software, the desig
n method of the structure is carried out accordi
ng to the top-dow
n desig
n idea. I
n thewhole process of the desig
n, the surface desig
n is applied to the special positio
n of the parts by meeti
ng the requireme
nts of the processi
ng tech
nology. for the tra
nsmissio
n precisio
n of gear, it is i
ndicated i
n the e
ngi
neeri
ng drawi
ng, that is, the mea
ns of higher processi
ng requireme
nts, a
nd the desig
ned oil level measuri
ng meter ca
n meet the shortcomi
ngs of the existi
ng products o
n the market a
nd make up for better the results a
nd importa
nt co
nclusio
ns of the actual
needs of the equipme
nt. Keywords：Liquid level meter;UG;Auto-CAD 目录 摘要I AbstractⅡ 1绪论1 1.1课题研究的目的及意义1 1.2国内外研究现状3 1.3本课题研究内容3 2油位计的分析5 2.1油位计的构成5 2.2油位计的工作原理6 2.3影响油位计精度的因素7 2.4油位计的应用8 3油位计的设计11 3.1油位计的工艺设计12 3.2表盘与表体13 3.3浮球的设计14 3.4传动部分的设计14 3.5信号传输电路与报警电路的设计16 4油位计参数的计算19 4.1油位计外轮廓参数的计算19 4.1.1表盘的直径和量程19 4.1.2表体设计19 4.2设计摆杆20 4.2.1摆杆与浮球、指针之间的运动形式20 4.2.2摆杆的摆动角度及长度21 4.3齿轮的计算与选择21 4.3.1齿轮种类的选择22 4.3.2齿轮参数的确定22 4.3.3齿轮设计校核24 5硬件电路设计27 5.1具有远传信号的电路设计27 5.2报警电路设计27 6总结29 参考文献30 致谢31 附录a 33 外文文献及翻译33