發(fā)布時間：2019-05-10 01:28

【摘要】：帶式輸送機(jī)廣泛應(yīng)用于各行各業(yè)散料物料的輸送。隨著長距離、大運(yùn)量、高帶速要求的提高,帶式輸送機(jī)的能源損耗問題越來越突出。主要阻力是造成帶式輸送機(jī)能源損耗的主要原因,壓陷滾動阻力約占主要阻力的50%-80%。而決定壓陷滾動阻力大小的影響因素眾多,較為準(zhǔn)確地計算壓陷滾動阻力存在較大困難,其中溫度對壓陷滾動阻力的影響較為突出。而我國幅員遼闊,南北溫差較大,很有必要對壓陷滾動阻力的產(chǎn)生機(jī)理及其隨溫度等影響因素的變化規(guī)律進(jìn)行研究。課題采用了機(jī)理理論分析、數(shù)值模擬敏感性分析和試驗測試相結(jié)合的方法,對壓陷滾動阻力特性進(jìn)行了研究。首先,研究了帶式輸送機(jī)壓陷滾動阻力產(chǎn)生機(jī)理,通過對輸送帶覆蓋層材料進(jìn)行不同溫度,不同載荷下的靜態(tài)蠕變試驗,獲得不同條件下的蠕變曲線,利用最小二乘法對蠕變曲線進(jìn)行非線性擬合,通過相關(guān)性分析,得到三元件Maxwell固體模型的輸送帶覆蓋層橡膠材料的粘彈特性曲線圖,把由橡膠的DMA試驗數(shù)據(jù)擬合得到的粘彈特性模量隨溫度變化的數(shù)學(xué)函數(shù)導(dǎo)入三元件Maxwell模型,建立了基于溫度效應(yīng)的壓陷滾動阻力數(shù)學(xué)模型。然后,應(yīng)用MATLAB軟件編寫壓陷滾動阻力計算程序,數(shù)值模擬研究了壓陷滾動阻力隨溫度、帶速、覆蓋層厚度、加載條件等影響因素的變化規(guī)律,獲得了壓陷滾動阻力特性曲線。為了求解的方便,給出了Maxwell模型中溫度函數(shù)的確定方法和覆蓋層與托輥接觸長度a和b的確定方法。最后,設(shè)計并制造了帶式輸送機(jī)壓陷滾動阻力測試系統(tǒng),試驗測試了不同帶速和加載條件及不同溫度下壓陷滾動阻力的變化情況,并與MATLAB數(shù)值模擬結(jié)果進(jìn)行對比分析,從而驗證理論的可靠性與正確性,由此給出了槽形托輥組壓陷滾動阻力計算方法。通過以上研究,建立了基于溫度效應(yīng)的壓陷滾動阻力的數(shù)學(xué)物理模型,并且在一定條件下,壓陷滾動阻力具有隨著溫度的升高而增大,隨帶速的增大而增大,隨加載的增大而增大的變化規(guī)律。所做研究具有重要的理論意義和實際生產(chǎn)價值,有助于提高帶式輸送機(jī)輸送效率,最大限度減小能源損耗并指導(dǎo)設(shè)計。
[Abstract]:Belt conveyor is widely used in the transportation of bulk materials in various industries. With the increase of long distance, large traffic volume and high belt speed, the energy loss of belt conveyor is becoming more and more prominent. The main resistance is the main cause of energy loss of belt conveyor, and the rolling resistance accounts for about 50% and 80% of the main resistance. However, there are many factors that influence the rolling resistance of collapse, so it is difficult to calculate the rolling resistance of collapsing accurately, and the effect of temperature on rolling resistance of collapsing is more prominent. However, it is necessary to study the mechanism of rolling resistance and its variation with temperature due to its vast territory and large temperature difference between the north and the south of China. In this paper, the rolling resistance characteristics of collapse are studied by means of mechanism theory analysis, numerical simulation sensitivity analysis and experimental test. Firstly, the mechanism of rolling resistance of belt conveyor is studied. The creep curves under different conditions are obtained by static creep tests of conveyor belt overburden materials at different temperatures and loads. The creep curve was fitted by the least square method, and the viscoelastic curve of the rubber material covered by belt was obtained by correlation analysis of the three-element Maxwell solid model. The mathematical function of viscoelastic modulus varying with temperature from DMA test data of rubber was introduced into the three-element Maxwell model, and a mathematical model of rolling resistance of collapse based on temperature effect was established. Then, the calculation program of collapse rolling resistance is compiled by MATLAB software, and the variation of collapse rolling resistance with temperature, belt speed, coating thickness, loading condition and other influencing factors is studied by numerical simulation, and the characteristic curve of collapse rolling resistance is obtained. In order to solve the problem conveniently, the method of determining the temperature function in the Maxwell model and the contact length a and b between the covering layer and the roller are given. Finally, the rolling resistance test system of belt conveyor is designed and manufactured. The variation of the rolling resistance of belt conveyor under different belt speed and loading conditions and different temperatures is tested and compared with the results of MATLAB numerical simulation. Thus, the reliability and correctness of the theory are verified, and the calculation method of collapse rolling resistance of slot roller group is given. Through the above research, the mathematical and physical model of collapse rolling resistance based on temperature effect is established, and under certain conditions, the collapse rolling resistance increases with the increase of temperature and with the increase of band speed. The law of change that increases with the increase of loading. The research has important theoretical significance and practical production value, which is helpful to improve the transportation efficiency of belt conveyor, minimize energy loss and guide the design.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH222

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