本文選題：帶式輸送機(jī) + 張緊裝置��； 參考：《太原理工大學(xué)》2017年碩士論文

【摘要】：礦用帶式輸送機(jī)是煤礦綜采裝備的重要組成部分,主要用于散裝物料的運(yùn)輸工作,其正常運(yùn)行是保障綜采工作面生產(chǎn)效率的關(guān)鍵。張緊裝置為提供輸送帶正常運(yùn)行所需張力,是用以保證帶式輸送機(jī)正常運(yùn)行的必要機(jī)構(gòu)。對(duì)大型帶式輸送機(jī)來說,其張緊裝置動(dòng)態(tài)特性直接影響著帶式輸送機(jī)的工作性能。因此,對(duì)于張緊裝置的研究具有非常重要的意義。隨著帶式輸送機(jī)的發(fā)展,張緊裝置動(dòng)態(tài)特性對(duì)其性能的影響越來越大。由于輸送帶具有蠕變特性,使其在運(yùn)行過程中會(huì)因變長而松弛,系統(tǒng)各部分均表現(xiàn)出較強(qiáng)的非線性和時(shí)變性,要求張緊裝置輸出張力必須實(shí)現(xiàn)連續(xù)控制以適應(yīng)負(fù)載的動(dòng)態(tài)變化。以DSJ160/350/3×500型可伸縮帶式輸送機(jī)為例,依據(jù)“逐點(diǎn)張力法”,對(duì)該帶式輸送機(jī)不同工況正常運(yùn)行過程中所需張力條件進(jìn)行計(jì)算分析。提出一種新型張緊裝置設(shè)計(jì)方案,即永磁變頻自動(dòng)張緊裝置,并完成了該系統(tǒng)的設(shè)計(jì)。新型永磁變頻自動(dòng)張緊裝置是以永磁同步電機(jī)和變頻器作為主要驅(qū)動(dòng)機(jī)構(gòu)的張緊系統(tǒng),大大簡化了機(jī)械結(jié)構(gòu),并從根本上解決了液壓張緊裝置故障率高、響應(yīng)速度慢等問題。利用AMESim和Matlab軟件,建立帶式輸送機(jī)和永磁變頻自動(dòng)張緊裝置的仿真模型,聯(lián)合仿真進(jìn)行動(dòng)力學(xué)仿真實(shí)驗(yàn),并對(duì)仿真結(jié)果進(jìn)行分析。在帶式輸送機(jī)滿載運(yùn)行的工況中,通過分析游動(dòng)小車以及輸送帶關(guān)鍵點(diǎn)的位移曲線、速度曲線、張力曲線,分析可得:滿載運(yùn)行的工況下,帶式輸送機(jī)啟動(dòng)59s時(shí),速度傳到機(jī)尾,機(jī)尾加速度大于機(jī)頭加速度,容易產(chǎn)生震蕩;滿速運(yùn)行時(shí),機(jī)頭張力約為機(jī)尾張力的4倍,機(jī)頭驅(qū)動(dòng)滾筒、機(jī)架、卸料滾筒等相比機(jī)尾機(jī)構(gòu)更容易損壞;機(jī)尾410s開始移動(dòng),游動(dòng)小車413s開始動(dòng)作,張緊裝置的調(diào)節(jié)對(duì)于輸送帶張力變化有一定的滯后,滯后時(shí)間為3s;永磁變頻自動(dòng)張緊裝置能夠?qū)斔蛶埩M(jìn)行實(shí)時(shí)的調(diào)節(jié),滿足運(yùn)行時(shí)輸送帶對(duì)張力的需求。對(duì)應(yīng)用永磁變頻張緊裝置的不同帶式輸送機(jī)的動(dòng)態(tài)性能進(jìn)行對(duì)比仿真實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果表明:滿載工況相比空載工況而言,張緊裝置需輸出更大的功率,此外,驅(qū)動(dòng)滾筒緊邊張力要大得多;輸送帶彈性模量越小,游動(dòng)小車移動(dòng)速度的峰值越大,達(dá)到峰值所需的時(shí)間越長,小車的位移越長,彈性波在輸送帶中傳播的速度越小;輸送帶流變系數(shù)影響系統(tǒng)的穩(wěn)定性,流變系數(shù)越大,波動(dòng)越小。
[Abstract]:Belt conveyor is an important part of fully mechanized coal mining equipment, which is mainly used in bulk material transportation, and its normal operation is the key to ensure the production efficiency of fully mechanized mining face. Tensioning device is necessary to ensure the normal operation of belt conveyor in order to provide the tension required for normal operation of conveyor belt. For large belt conveyor, the dynamic characteristics of its tensioning device directly affect the working performance of belt conveyor. Therefore, it is of great significance to study the tensioning device. With the development of belt conveyor, the dynamic characteristics of tensioning device have more and more influence on its performance. Because of the creep property of the conveyor belt, it will be relaxed in the process of running, and all parts of the system show strong nonlinearity and time-varying. It is required that the tension output of the tensioning device must be controlled continuously to adapt to the dynamic change of the load. Taking DSJ160/350/3 脳 500-type retractable belt conveyor as an example, according to "point-to-point tension method", the tension conditions required in the normal operation of the belt conveyor under different working conditions are calculated and analyzed. A new type of tensioning device, permanent magnet frequency conversion automatic tensioning device, is proposed, and the design of the system is completed. The new type of permanent magnet frequency conversion automatic tensioning device is a tension system with permanent magnet synchronous motor and frequency converter as the main driving mechanism, which greatly simplifies the mechanical structure and fundamentally solves the problems of high failure rate and slow response speed of hydraulic tensioning device. Using AMESim and Matlab software, the simulation model of belt conveyor and permanent magnet frequency conversion automatic tensioning device is established, and the dynamic simulation experiment is carried out jointly, and the simulation results are analyzed. In the condition of full load running of belt conveyor, by analyzing the displacement curve, velocity curve and tension curve of the key points of the moving trolley and the conveyor belt, we can get: under the condition of full load operation, the belt conveyor starts for 59s. Speed to the tail, the tail acceleration is greater than the nose acceleration, easy to produce shock; full speed operation, the nose tension is about 4 times of the tail tension, the nose drive drum, frame, discharge drum and so on are more easily damaged than the tail mechanism; The rear 410s begin to move, the swimming trolley 413s begin to move, the adjustment of the tensioning device has a certain lag to the change of the belt tension, the lag time is 3s; the permanent magnet frequency conversion automatic tensioning device can adjust the belt tension in real time. To meet the operational requirements of the conveyor belt tension. The dynamic performances of different belt conveyors with permanent magnet frequency conversion tensioning device are compared and simulated. The experimental results show that the tensioning device needs more power output than the no-load condition under the full load condition. The smaller the elastic modulus of the conveyor belt, the greater the peak value of the moving speed, the longer the time required to reach the peak value, the longer the displacement of the vehicle and the smaller the velocity of elastic wave propagating in the conveyor belt. Conveyor belt rheological coefficient affects the stability of the system, the larger the rheological coefficient, the smaller the fluctuation.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD634.1

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本文編號(hào)：1936764