本文選題：圓管帶式輸送機　切入點：傳動滾筒　出處：《湖南科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：圓管帶式輸送機是一種新型環(huán)保高效的散料輸送設備,廣泛應用于冶金、礦業(yè)、化工、電力、建材、港口等行業(yè)的散料輸送系統(tǒng)。其傳動結構主要包括傳動滾筒與托輥。其中,傳動滾筒作為動力傳遞部件,承受全部驅(qū)動載荷及皮帶壓力載荷。托輥為數(shù)量最多的部件,強制輸送帶圓管狀并支撐其運行,從而實現(xiàn)對物料的封閉輸送。傳動滾筒及托輥與輸送帶之間的接觸情況會影響到傳遞效率及輸送帶受力,影響輸送帶的磨損及使用壽命,從而也會重影響到整機的可靠性。首先,以傳動結構部件傳動滾筒為對象,基于有限元思想進行滾筒的受力分析,分別建立圓柱型、腰鼓型、內(nèi)凹型三種不同結構形式傳動滾筒靜力學與動力學有限元模型,分析三種不同結構形式傳動滾筒應力分布及變形情況。分析得出:傳動滾筒應力主要分布在筒體中間區(qū)域,筒體與輻板連接區(qū)域以及輻板上接觸點與奔離點所對應區(qū)域,傳動滾筒中間區(qū)域的變形最大;當筒體中間位置出現(xiàn)殘余不平衡量時,兩端支撐軸承處振動位移和軸承傳遞力大小隨轉(zhuǎn)速成指數(shù)函數(shù)增大。通過對比三種結構形式傳動滾筒力學性能,得出內(nèi)凹型傳動滾筒力學性能較佳。然后,針對圓管帶式輸送機中數(shù)量最多傳動結構部件托輥進行受力分析,找出影響不同位置處托輥接觸力變化的因素,建立考慮輸送帶彈性的圓管輸送帶-托輥組剛?cè)狁詈蟿恿W模型,分析勻速和勻加速兩種典型工況下不同位置處托輥接觸力變化,與沒有考慮輸送帶彈性的剛體動力學模型分析結果對比。結果表明:位于上部三個托輥所受接觸力等于輸送帶成形力反作用力,主要與輸送帶彈性系數(shù)、面膠厚度及管徑有關;下部三個托輥所受接觸力等于輸送帶成形力反作用力與各自承受的輸送帶重力分量之和,不僅與成形力影響因素有關,還受單位輸送帶質(zhì)量及托輥間距影響;考慮輸送帶彈性,托輥接觸力平均值減小80%,波動值增大4倍以上;勻速下,各托輥接觸力變化過程中出現(xiàn)“尖峰”現(xiàn)象,達到最小值過程中變化稍緩慢,為周期性變化的高幅值交變載荷;上下兩托輥接觸力平均值及波動變化值較其他托輥大;勻加速下,托輥接觸力隨速度增大出現(xiàn)“震蕩”現(xiàn)象。最后,自主設計搭建圓管輸送帶-托輥組動態(tài)接觸力模擬測試實驗臺,開展勻速工況下托輥接觸力測試與分析,結果表明與剛?cè)狁詈蟿恿W模型仿真分析結果各托輥接觸力變化形式一致,驗證了剛?cè)狁詈蟿恿W模型分析結果。
[Abstract]:Circular pipe belt conveyor is a new type of environmental protection and efficient bulk conveying equipment, widely used in metallurgical, mining, chemical, electric power, building materials, port and other industries. The drive drum, as a power transmission component, bears all the driving loads and belt pressure loads. The roller is the largest number of components, which force the conveyer belt to be circular in shape and to support its operation. Thus, the closed conveying of materials can be realized. The contact between the transmission drum and the roller and the conveyor belt will affect the transmission efficiency and the force of the conveyor belt, and affect the wear and service life of the conveyor belt. This will also affect the reliability of the whole machine. First of all, taking the transmission drum of the transmission structure as an object, based on the finite element method, the force of the roller is analyzed, and the cylindrical and waist drum types are established, respectively. The finite element model of statics and dynamics of three kinds of internal concave type drive drum is analyzed, and the stress distribution and deformation of three different structural forms are analyzed. It is concluded that the stress distribution of the driving drum is mainly in the middle region of the cylinder body. The deformation of the middle part of the transmission drum is the largest in the connection region between the cylinder and the radial plate and the corresponding region between the contact point and the runaway point on the radial plate, and when the residual unbalance occurs in the middle position of the cylinder, The vibration displacement and bearing transfer force increase with the rotation speed. By comparing the mechanical properties of three kinds of structural driving drum, it is concluded that the mechanical properties of the inner concave drive drum are better. According to the force analysis of the roller with the largest number of driving structure components in the circular pipe belt conveyor, the factors influencing the contact force of the roller at different positions are found out. A rigid-flexible coupling dynamic model of pipe conveyor belt and roller group considering the elasticity of conveyor belt is established, and the change of roller contact force at different positions under uniform speed and uniform acceleration is analyzed. The results show that the contact force of the top three rollers is equal to the reaction force of the belt forming force, which is mainly related to the elastic coefficient of the conveyor belt, the thickness of the surface glue and the diameter of the pipe. The contact force of the lower three rollers is equal to the sum of the reaction force of the belt forming force and the gravity component of the conveyor belt, which is not only related to the influencing factors of the forming force, but also affected by the quality of the unit conveyor belt and the distance between the rollers. The average contact force of the roller decreases by 80 and the fluctuation value increases by more than 4 times. Under the constant velocity, the phenomenon of "peak" appears in the change of the contact force of each roller, and the change is a little slow in the process of reaching the minimum value, which is the high amplitude alternating load of periodic variation. The average and fluctuating values of the contact force of the top and bottom rollers are larger than those of the other rollers. Under uniform acceleration, the contact force of the two rollers oscillates with the increase of the speed. Finally, Design and build the dynamic contact force simulation test bench of the pipe conveyor belt and roller group, and carry out the testing and analysis of the roller contact force under the constant speed working condition. The results show that the results are consistent with the simulation results of rigid-flexible coupling dynamic model and verify the results of rigid-flexible coupling dynamic model.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH222

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