| With the development of coal mining technology,because of the simple installation,convenient operation,transportation distance and can realize the function of continuous transportation,in coal mining work,is often used as underground coal mine auxiliary transportation equipment,and the use of more and more common.However,due to the collision caused by the downhill or emergency stop of the stepless continuous tractor,equipment failure can even cause safety accidents,which has a serious impact on the safe transportation of personnel or materials of the continuous tetherless tractor.Therefore,this paper puts forward a buffer device for improving the safety of the poleless rope continuous tractor,and takes this as the research object.Firstly,the overall mechanism composition and working principle of the buffer device are analyzed,and on this basis,the dynamic model of different number of vehicle groups is established.The model is used to simulate the operation behavior of shuttle train and the influence of buffer device on the operation safety of shuttle train under different mine roadway conditions.The main work of this paper is as follows:(1)This paper expounds the research background of the buffer device of endless rope continuous tractor and the research methods of the related problems of the buffer device at home and abroad.The difficulties that need to be studied in depth and the performance feasibility of the buffer device are analyzed,and the research objectives and main contents of the paper are put forward.(2)The design requirements and main performance parameters of the buffer device are proposed according to the actual working conditions.The main functional parts of the buffer device of rope continuous tractor without electric pole are designed,and the spring parameters are calculated,including the design of the main and key parts of the buffer device.(3)Based on the analysis of the single operation of the continuous tractor-trailer,the longitudinal dynamic model of the train set is established to analyze the interaction between the vehicles during the operation.On this basis,considering the actual situation of coal mine roadway,the mathematical models of different number of vehicle groups in straight roadway,horizontal curve and vertical curve are established.Through MATLAB to complete the solution,the impact of different routes,different curve radius and different track slope on collision stability and buffer device performance is discussed.The results showed that: The adjustment time of each vehicle in shuttle train group is affected by curve radius and track slope.The smaller the curve radius or the larger the track slope,the longer the adjustment time of each vehicle;under different lines with the same curve radius and track slope,the displacement and speed of each vehicle in different numbers of shuttle train groups reached the response peak in a short response time,and gradually stabilized,which proved the feasibility of the performance of the buffer device.(4)The buffer model of the key components of the buffer device is established,and the transient dynamic analysis and fatigue characteristics analysis are completed by using the finite element software combined with the mathematical model calculated.The results showed that: The key structure of the buffer device Under the impact of repeated collisions,the stress concentration occurs at the middle block of the buffer and the rear spring,and the stress value is the largest,which will cause fatigue damage The fatigue damage under straight roadway,horizontal curve and vertical curve mainly occurs at the inner side of the spring,resulting in a very small fatigue life in this area.Figure 47 Table 4 Reference 68... |
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