阈值自调节与抗干扰矿用开停传感器研制

Development of threshold self-adjusting and anti-interference start-stop sensor for mine

针对煤矿井下开停传感器自动化程度低、阈值难调节及易受周围设备干扰导致误判等问题,通过实验论证,将磁电阻效应检测技术应用于煤矿井下设备开停检测,可定量的检测电缆中电流值与磁场值的关系,用于传感器开/停阈值的调节。首先,对常用的三芯电缆建模仿真,推导出电缆任意位置的磁场强度大小,从理论上分析电缆周围的漏磁场的分布规律;其次,设计实验验证不同位置电流值与磁场变化的关系,并提出了传感器自调节开/停阈值的方法;然后,研究磁场屏蔽技术,通过实验验证06Cr13不锈钢可有效的屏蔽外界干扰磁场;最后,通过现场验证设计传感器可靠性和抗干扰性能,减少了现场安装调试工作量。此外,传感器还可以通过上位机标记自调节开/停阈值。

Aiming at the problems of low automation,difficult threshold adjustment and misjudgment caused by the interference of surrounding equipment,the magnetoresistance effect detection technology is applied to the start and stop detection of coal mine equipment for the first time through experimental demonstration,which can quantitatively detect the relationship between the current value and magnetic field value in the cable,and can be used to adjust the start/stop threshold of the sensor.Firstly,the magnetic field intensity at any position of the cable is deduced by modeling and simulation of three-core cable,and the distribution law of magnetic leakage field around the cable is analyzed theoretically.Secondly,experiments are designed to verify the relationship between the current value and the change of magnetic field at different positions,and a method of self-adjusting start/stop threshold is proposed.Then,the magnetic field shielding technology is studied,and the experimental results show that06 Cr13 stainless steel can effectively shield the external interference magnetic field.Finally,the reliability and anti-interference performance of the designed sensor are verified on site,which reduces the workload of on-site installation and debugging.In addition,the sensor can also be marked on and off by the upper computer/stop threshold.