【作者】 苏国秀；

【导师】 程居山；

【作者基本信息】 山东科技大学 ， 机械电子工程， 2005， 硕士

【摘要】 目前,我国大部分煤矿井下液压支护设备所使用的乳化液仍采用传统的配制方法和检测手段,很不适用生产的需要。 本课题针对传统检测手段及配液方式的不足,把乳化液浓度的配比和检测有机结合起来,在PID控制的基础上,研制出一套在线检测乳化液浓度并实现自动配比的系统。 其中乳化液的配比部分是利用通过文丘里管的高速水流在在其喉管处产生的负压将油吸上来的工作原理进行配比的。 乳化液的检测是以AT89C51单片机为控制核心,以比例流量阀和进水电磁阀为执行机构,传感器(流量传感器、油位传感器、液位传感器)用来作检测元件。单片机先把入口水流量、油位、乳化液箱高低液位转换成电信号,然后单片机再根据浓度和液位信号,自动完成配比任务,使乳化液的浓度按用户需求控制在3%～5%内和控制乳化箱液位在合理范围内,且直接液晶显示浓度的大小,为液压支架或液压支柱等设备提供稳定的工作介质。更多还原

【Abstract】 At present, most coal mines of our country adopt traditional detection means for density of the emulsion. The precision of the detection means is relatively low . Some coal mines of Our country adopt artificial ground mixing way to mix the liquid still. Some coal mines mix liquid by mix valve too.This subject directly against the deficiency of the mixing liquid way and traditional detection means combine the matching with measuring of the density of the emulsion. On the basis of the PID control, a set of systems realized "testing on line" and "control on time" the density of the emulsion.The emulsion carried on matching to utilize negative pressure of the high-speed rivers through the verturimeters throat.The measuring of the emulsion is to regard AT89C51 singlechip microcomputer as the controlling core. And the electromagnetic valve of water and the valve of proportion is regarded as the executive body .And sensors(liquid sensor、 Oil level sensor、 liquid level sensor) is regard measuring component. Firstly transform water quantity、 liquid level、 Oil level sensor into electric signal. Then singlechip microcomputer automaticly accomplish mixing according to density and reach to 3%~5% density of emulsion according to user’s desire, and control emulsion chest inappropriate range. It provides steady emulsion for hydraulic strut and hydraulic bracket.更多还原