采煤机液压混合动力截割传动系统设计及性能分析

发布时间：2018-05-08 19:03

本文选题：采煤机 + 截割阻力矩　；参考：《重庆大学》2015年硕士论文

【摘要】：作为煤炭综采工作面的一种主要采掘设备,采煤机被广泛应用于各大小煤矿,其功能是割煤和装煤。采煤机的割煤主要是利用滚筒上的截齿与煤岩进行冲击和碰撞,从而达到实现煤岩脱落的目的。采煤机的装煤主要是通过滚筒螺旋叶片的螺旋面实现的,因此截割部的性能直接决定了采煤机工作性能。由于当前采煤机的滚筒转速是恒定的,都是通过调节牵引速度以适应煤层变化,导致粉尘大、块煤率低、工作环境恶劣等问题,对采煤机截割性能的提高产生极大的局限性。为此本文以传统采煤机为基础进行了分析研究,设计了一种可以实现滚筒转速调节的采煤机截割传动系统,使采煤机在各种煤层条件下都有较好地适应性。①对采煤机的结构、煤岩的物理机械特性、切削厚度和滚筒负载特性进行了分析,得出牵引速度与滚筒转速对切削厚度和滚筒负载的影响,最终分析得出滚筒转速调节的必要性。②在分析采煤机工作过程和行星齿轮机构的基础之上,进行了不同传动方案的选择,最终,在传统采煤机截割系统的基础上,设计了一种可以实现滚筒转速调节的液压混合动力截割传动系统,其中,差动行星齿轮的输入端分别传递截割电机和液压马达的动力,液压马达的动力则来自于调高系统的液压功率。其利用了行星齿轮差动动力耦合功能,通过改变液压泵的排量可以实现滚筒转速的调节。此外,还进行了机械传动系统和液压传动系统的参数匹配。③建立了行星齿轮、液压泵、液压马达等系统主要部件的数学模型,基于AMESim和MATLAB/Simulink软件平台进行了主要部件仿真模型、系统仿真模型、负载模型和PID控制模型的建立。进行了AMESim-Simulink联合仿真,对液压马达转速和滚筒转速的跟踪性能、动态响应及缓冲性能进行了仿真分析。验证了所设计液压混合动力截割传动系统的可行性。结果表明,液压马达转速及滚筒转速具有较好的跟踪性能和动态响应,液压系统可以缓和负载突变产生的冲击。
[Abstract]:As one of the main mining equipment in fully mechanized coal mining face, the shearer is widely used in all kinds of coal mines, and its function is to cut and load coal. The coal cutting of shearer is mainly to impact and collide with coal and rock by means of cutting teeth on the drum, so as to achieve the purpose of coal and rock shedding. The coal loading of the shearer is mainly realized by the helical surface of the spiral blade of the drum, so the performance of the cutting part directly determines the working performance of the shearer. At present, the rotary speed of the shearer is constant, which is caused by adjusting the traction speed to adapt to the change of coal seam, which leads to the problems of large dust, low lump coal rate and bad working environment, which has great limitations on the improvement of cutting performance of shearer. In this paper, based on the analysis of traditional shearer, a cutting drive system of shearer is designed, which can adjust the rotational speed of drum, so that the shearer has better adaptability to shearer structure under various coal seam conditions. The physical and mechanical characteristics of coal and rock, cutting thickness and roller load characteristics are analyzed, and the influence of traction speed and drum speed on cutting thickness and cylinder load is obtained. Finally, it is concluded that the necessity of drum speed regulation .2 on the basis of analyzing the working process of shearer and planetary gear mechanism, different transmission schemes are selected. Finally, on the basis of cutting system of traditional shearer, A hydraulic hybrid power cutting drive system which can adjust the rotational speed of the cylinder is designed, in which the input end of the differential planetary gear transfers the power of the cutting motor and the hydraulic motor, respectively. The power of the hydraulic motor comes from the hydraulic power of the system. By using the differential dynamic coupling function of planetary gear, the rotary speed of the cylinder can be adjusted by changing the displacement of the hydraulic pump. In addition, the mathematical models of the main components of the planetary gear, hydraulic pump and hydraulic motor are established by matching the parameters of the mechanical transmission system and the hydraulic transmission system. The simulation model of the main components is carried out based on the software platform of AMESim and MATLAB/Simulink. System simulation model, load model and PID control model. The tracking performance, dynamic response and buffer performance of hydraulic motor and drum speed are simulated and analyzed by AMESim-Simulink simulation. The feasibility of the hydraulic hybrid power cutting drive system is verified. The results show that the hydraulic motor speed and drum speed have better tracking performance and dynamic response, and the hydraulic system can mitigate the shock caused by the sudden change of load.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD421.6

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