【作者】 周小凤；

【导师】 贾华；

【作者基本信息】 内蒙古科技大学 ， 控制理论与控制工程， 2007， 硕士

【摘要】 由于在矿山开采的整个过程中,都没有在线的计量装置,因此对电铲司机和运输司机的工作量考核只能以车次计量,这就带来了很多弊端,有些操作人员为夸大产量,经常性的使车处于欠载状况,造成资源浪费。而有些时候却由于车的过载引发安全问题。针对以上原因,我们提出了在电铲上对矿物在线动态称重系统的研究方案,也就是本文的题目:矿用电铲动态称重计量系统。本课题的理论依据是牛顿第二定律F=ma。首先分析矿用电铲的结构及运动规律,然后结合动力学知识分析作用在铲斗上的各个力及变量,对这些力和变量选择合适的传感器去检测,最后应用牛顿第二定律求出矿物的质量也即重量。其实现方法是通过单片机即AT89C52进行数据的获取,而由PC机进行数据的处理。AT89C52控制各个传感器定时去采样力或变量的值,而后把采集回来的数据通过串行口发送给PC机,由PC机对数据进行处理。AT89C52上的实现:控制传感器采集数据,传感器有模拟的和数字的,采回来的数据都要首先经过信号处理,然后再进入单片机AT89C52或者是AT89C52扩展的外部I/O口8255。由于AT89C52的运算能力低,所以把采集的数据通过串行通信方式传送给PC机。AT89C52除了实现通信功能外,还增加一些附加的功能,如针对一些矿山“勺杆射出”的故障,实现了限位报警功能;用X25045芯片实现看门狗、电压监控、数据保存的功能;另外还扩展了LCD显示器,显示由PC机传过来的数据。PC机上的实现:在PC机上应用Visual C ++语言实现了通信功能,即接收和发送数据;对数据进行处理;把结果进行显示、存储和打印等。更多还原

【Abstract】 Because there is not any calculation device in the process of mine explore, so the examination for power shovel and transport’s driver is the times of mine car, it will result to lots of irregularity. Due to some manipulators’exaggeration , the mine car is owing frenquentlly, so it bringing about waste of resource . But sometime there is the problem of security because mine car’s overload. Aim at the above reasons, we bring up the proposal of a dynamic weighing system are presented of mining shovel, and it is my topic.It base on the second theory of Newton, F=ma. First, ayalyzing the structure and action of mining shovel, find out strengthes and variables for shove, and select suitable sensors to measure these variables which affect it’s weight . Finally, applying Newton law seek the weight of mineral .AT89C52 obtain the datas and PC deal with these datas.the systerm adopt AT89C52 to achieve sample at regular time, these value of samples are transmitted to Personal computer. Personal computer receives datas and deal with those datas.The function of AT89C52: Controling simulated and digital sensors to sample datas. These datas which following disposal circuit enter into AT89C52 or 8255. Because AT89C52’s ability of caculation is lower,so these sampling datas to be transmitted to PC by way of serial communication.additionally,it can increase some additional functions. For example , including some functions of report to police and LCD display.The function of PC: applying Visual C ++ language achieve the most primordial function of serial communication. Including receive、showing、save and print results. It can communicate essencial datas with AT89C52 by means of serial commuciation.更多还原