本文選題：齒輪流量計(jì)　切入點(diǎn)：動(dòng)態(tài)特性　出處：《安徽理工大學(xué)》2016年碩士論文

【摘要】：齒輪流量計(jì),作為一種測(cè)量精度較高的容積式流量計(jì),正被廣泛地應(yīng)用于重油、樹脂、聚乙烯醇等較高粘度介質(zhì)的流量測(cè)量中。雖然穩(wěn)態(tài)流量的測(cè)量技術(shù)已經(jīng)成熟,但是在測(cè)量動(dòng)態(tài)流量,尤其在測(cè)量液壓系統(tǒng)高壓側(cè)的動(dòng)態(tài)流量方面一直不盡如人意,存在較大的誤差。流量計(jì)的動(dòng)態(tài)特性不僅會(huì)受到一次儀表的影響,二次儀表對(duì)其也存在一定的影響,本文所研究的主要內(nèi)容即齒輪流量計(jì)的二次儀表�，F(xiàn)將本文所做工作歸納如下：(1)設(shè)計(jì)了一種基于Modbus總線協(xié)議支持遠(yuǎn)程實(shí)時(shí)監(jiān)控的標(biāo)準(zhǔn)化表頭。調(diào)試階段以高性價(jià)比1T單片機(jī)12C5A60S2作為控制芯片,利用單片機(jī)自帶PCA模塊精準(zhǔn)測(cè)頻,利用單片機(jī)自帶10位AD采集流量傳感器送來的電壓信號(hào),PWM模塊(脈寬調(diào)制)配合接口電路模擬DA穩(wěn)定輸出模擬電壓信號(hào)。按照IEEE754單精度浮點(diǎn)數(shù)標(biāo)準(zhǔn)由RS485負(fù)邏輯電平差分信號(hào)組成半雙工通信網(wǎng)絡(luò),數(shù)據(jù)鏈路層基于Modbus標(biāo)準(zhǔn)協(xié)議將流量計(jì)表頭所測(cè)數(shù)據(jù)傳輸至上位機(jī)。上位機(jī)監(jiān)控系統(tǒng)采用亞控組態(tài)王軟件編寫,支持遠(yuǎn)程訪問、數(shù)據(jù)超限報(bào)警、參數(shù)設(shè)定等功能。表頭的制作使得后面的實(shí)驗(yàn)結(jié)果能夠直觀的顯示出來。(2)改進(jìn)了原有的實(shí)驗(yàn)臺(tái)。該試驗(yàn)臺(tái)通過PLC來控制變頻器以進(jìn)一步控制電機(jī),由電機(jī)來帶動(dòng)齒輪旋轉(zhuǎn),最終實(shí)現(xiàn)模擬動(dòng)態(tài)流量信號(hào)的結(jié)果。通過實(shí)驗(yàn),流量計(jì)響應(yīng)動(dòng)態(tài)的頻率被再次提高,最終可以達(dá)到16.67Hz。(3)搭建了伺服閥、流量計(jì)綜合試驗(yàn)臺(tái)。該試驗(yàn)臺(tái)用于對(duì)齒輪流量計(jì)的動(dòng)態(tài)性能進(jìn)行研究,該試驗(yàn)臺(tái)不僅能對(duì)流量計(jì)的測(cè)量精度進(jìn)行標(biāo)定,而且還能在有壓力存在的環(huán)境下對(duì)流量計(jì)的動(dòng)態(tài)特性進(jìn)行測(cè)試。試驗(yàn)臺(tái)表頭顯示的壓力信號(hào)值與采集卡采集的信號(hào)繪制的圖表數(shù)值是一致的。這說明壓力信號(hào)采集系統(tǒng)工作穩(wěn)定可靠,而且通過該試驗(yàn)臺(tái)采集了大量寶貴的有用數(shù)據(jù),為下一步的分析和研究提供了依據(jù)。(4)通過FLUENT軟件對(duì)由三維建模軟件所建立的雙齒輪流量計(jì)中的齒輪進(jìn)行了仿真,做出壓力云圖、壓力矢量圖以及速度云圖和速度矢量圖,仿真結(jié)果與實(shí)驗(yàn)結(jié)果一致,驗(yàn)證了實(shí)驗(yàn)的正確性。
[Abstract]:Gear Flowmeter, as a kind of volumetric Flowmeter with high measuring precision, is widely used in flow measurement of heavy oil, resin, polyvinyl alcohol and other high viscosity media. However, the measurement of the dynamic flow rate, especially the dynamic flow rate of the high pressure side of the hydraulic system, is always unsatisfactory, and there are large errors. The dynamic characteristics of the Flowmeter are not only affected by the primary meter, Secondary instruments also have a certain impact on them. The main content of this paper is the secondary instrument of gear Flowmeter. In this paper, the work done in this paper is summarized as follows: 1) A standardized head based on Modbus bus protocol to support remote real-time monitoring is designed. In the debugging stage, the price is high. Compared to 1T single chip microcomputer 12C5A60S2 as the control chip, Using single-chip microcomputer with its own PCA module accurate frequency measurement, The voltage signal and PWM module (pulse width modulation) from 10 bits AD flow sensor are collected by single chip microcomputer, and the interface circuit simulates DA to output the analog voltage signal stably. According to the IEEE754 single precision floating-point standard, the negative logic electricity is produced by RS485. The half-duplex communication network is composed of flat differential signals. The data link layer transfers the data measured by the Flowmeter head to the upper computer based on the Modbus standard protocol. Parameter setting and other functions. The manufacture of the watch head makes the experimental results of the back can be displayed intuitively. The original experimental bench is improved. The test bed controls the frequency converter through PLC to further control the motor, and the motor drives the gear rotation. Finally, the result of simulating the dynamic flow signal is realized. Through the experiment, the frequency of the Flowmeter's response dynamic is raised again, and finally the servo valve is built up, which can reach 16.67 Hz. The test bench is used to study the dynamic performance of gear Flowmeter, which can not only calibrate the measuring accuracy of Flowmeter, The dynamic characteristics of the Flowmeter can also be tested in the presence of pressure. The pressure signal displayed by the tester head is in agreement with the chart drawn by the acquisition card. This shows that the pressure signal is collected. The set system works stably and reliably. Moreover, a large number of valuable and useful data are collected through the test bed, which provides the basis for further analysis and research. The gear in the double gear Flowmeter built by the three-dimensional modeling software is simulated by FLUENT software, and the pressure cloud diagram is made. The simulation results of pressure vector, velocity cloud and velocity vector are in agreement with the experimental results, and the correctness of the experiment is verified.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TH814.8

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