Dynamics characteristics analysis of coal plow system under starting and braking conditio
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摘要: 针对刨煤机系统在启动、制动工况下存在较大冲击的问题，综合考虑链轮多边形效应、驱动链轮轴的水平振动及驱动装置与刨链之间的耦合特性等因素，建立了刨煤机系统动力学模型；运用数值分析方法分析了刨煤机系统在启动、制动、制动后反向启动等工况下的动力学特性，得到刨头前后端刨链张力的振动特性曲线。分析研究结果表明，反“S”型启动方式下刨头前后端刨链张力所产生的冲击最为平稳，该方式启动对刨煤机系统更有优势；刨头距离机头处越近，启动时对刨头前后端刨链张力的影响越大，产生的冲击越大；由于机头与机尾存在时间差，导致前后端刨链张力在启动过程中出现了较大的张力冲击；刨煤机制动后，刨链前后张力分布不均出现差值，刨头前端刨链张力在反向重新启动时刻出现张力冲击，且随着启动过程呈下降趋势。该研究结果为设计合理的刨煤机启动、制动系统提供了理论基础。Abstract: In view of problems of large impact of coal plow system under starting and braking condition，dynamic model of the coal plow system was established comprehensively considering factors of sprocket wheel polygon effect, horizontal vibration of drive sprocket shaft, and coupling characteristics between driving device and plow chain. Dynamic characteristics of the system under condition of starting, braking and reverse starting after braking were analyzed by numerical analysis method, and vibration characteristics curves of the front and rear chain tension were obtained. The analysis results show that the system dynamic characteristic are the most stationary by using reverse "S" start scheme, the method is more advantageous to the coal plow system; the nearer the distance between the plow head and the machine head is，the larger plow chain tension impact is; due to time difference between nose and tail of the machine, tension in the front and back end of the chain has a great impact in the starting process; the plow chain tensions produce difference because of uneven distribution after the coal plow system barking，the plow chain tension of the front end has great impact at the reverse restart moment, and it falls with the starting process. The research results provide theoretical basis for designing reasonable start and brake system of the coal plow.
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