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MG—400/940WD采煤机遥控调高制动电液控制改装及应用

2018-11-21孙杰李鑫曲宝于连红黄亚江

科技创新与应用 2018年28期

孙杰 李鑫 曲宝 于连红 黄亚江

摘 要:MG-400/940WD型电牵引采煤机是由鸡西煤矿机械有限公司生产,在煤矿综采工作面上使用时由于其机体本身所带的液压调高、制动装置在使用过程中经常出现因系统油温过高,而且油箱内的液压油没有冷却系统,造成液压胶管密封圈由于高温造成老化串液以及液压元件经常损坏。更换需要时间而且投入较大,有时甚至因发现不及时造成油箱跑油,油泵吸空造成损坏,并且大都采用进口油泵,价格比较昂贵使生产成本加大,由于国产电磁阀使用寿命短,故障率高,当出现故障时影响采煤机调高和坡度大时的制动问题,进而影响了设备的开机率,针对以上这些问题而决定对其进行技术改造。

关键词:变频调速;调高;制动;遥控装置

中图分类号:TD421 文献标志码:A 文章编号:2095-2945(2018)28-0169-02

Abstract: MG-400/940WD electric haulage shearer is produced by Jixi Coal Mine Machinery Co., Ltd. When it is used in fully mechanized coal mining face, it is often used because of high hydraulic pressure and high oil temperature of the system. Moreover, the hydraulic oil in the oil tank has no cooling system, resulting in the aging of the hydraulic rubber tube sealing ring due to high temperature and the frequent damage to the hydraulic components. Replacement takes time and high expense, and sometimes because problems are not timely found even oil leakage occurs, oil pump suction is damaged. Most of them use imported oil pumps, so the price is more expensive to increase production costs, due to the short life of domestic solenoid valve, and the failure rate is high, which affects the braking problem of shearer when the shearer is high and the slope is large, and which affects the start-up rate of the equipment. In view of the above problems, it is decided to carry on the technical transformation to the shearer.

Keywords: variable frequency speed regulation; heightening; braking; remote control device

1 采煤机控制系统原理

采煤机内部是采用松下工业可编程控制器PLC和工控显示控制,通过10.4寸大屏幕彩色显示器显示内容有:当采煤机开机状态下各个电机温度显示,系统电压显示,当某个电机启动时,实时显示启动电流以及正常工作电流,牵引部分还显示牵引速度、牵引力的大小。机身几个部位都能对采煤机电气进行控制:中间手控;機身两端头操作站集中电控;离机时的遥控,距离范围在30m以内。交流变频调速系统采用一拖一方式,变频器采用ABB公司生产的ACS800系列变频器,这种变频器主要采用直接转矩控制的技术,可在无脉冲编码器和测速电机反馈的情况下,完成对交流牵引电机速度和转矩的准确控制。……

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