Design of gas electric locking detection device for safety monitoring system
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摘要: 煤矿安全监控系统多采用基于CAN总线的多主通信机制或基于RS485总线的主从通信机制，通过截取甲烷超限报文时刻和断电器断电报文时刻来计算断电时间。由于不同厂家监控系统通信机制、通信协议各不相同，无法设计统一的瓦斯电闭锁检测方法和装置。并且目前针对缩短瓦斯电闭锁断电时间的研究较多，但在瓦斯电闭锁检测方面的研究很少。针对上述问题，基于传感器通信切换和模拟传感器报文发送的检测方法设计了一种安全监控系统瓦斯电闭锁检测装置。传感器通信切换方法不受通信协议和总线形式的限制，检测时采用同一厂家传感器、分站、断电器和安全监控软件，不需要知晓通信协议。该方法操作简单，且不需要厂家配合，适用于采用主从通信机制的瓦斯电闭锁检测。模拟传感器报文发送方法由检测装置模拟甲烷传感器发送报文与分站通信，不需要知晓通信协议，不需要考虑通信机制问题，报文由厂家提供，按照报文发送顺序和次数进行配置。该方法操作较为繁琐，需要厂家提供通信报文，但测试精度更高，适用于各种通信协议的瓦斯电闭锁检测。验证结果表明：传感器通信切换方法不适合基于CAN总线的多主通信；基于RS485或CAN总线的模拟报文发送方法均可实现本地断电时间<2 s，异地断电时间<20 s；2种检测方法的计时精度均可达到0.01 s。Abstract: Coal mine safety monitoring systems mostly use CAN bus-based multi-master communication mechanism or RS485 bus-based master-slave communication mechanism, which calculates the power-off time by intercepting the time of methane overrun messages and the time of power-off messages of the breaker. Since the communication mechanism and communication protocol of the monitoring system of different manufacturers are different, it is impossible to design a unified gas locking detection method and device. At present, there are many researches for shortening the power-off time of gas electric locking, but there are few researches on gas electric locking detection. In order to solve the above problems, a gas electric locking detection device for safety monitoring system is designed based on the detection method of sensor communication switching and analog sensor message sending. The sensor communication switching method is not limited by the communication protocol and bus form, and the same manufacturer's sensors, substations, circuit breakers and safety monitoring software are used for detection, without the need to know the communication protocol. This method is simple to operate and does not require the cooperation of the manufacturer. It is suitable for gas electric locking detection using the master-slave communication mechanism. The analog sensor message sending method uses the detection device to simulate a methane sensor to send messages to communicate with the substation. There is no need to know the communication protocol or consider the communication mechanism. The messages are provided by the manufacturer and configured according to the order and times of message sending. This method is more cumbersome to operate and requires the manufacturer to provide communication messages. However, the test accuracy is higher and the method is suitable for gas electric locking detection of various communication protocols. The verification results show that the sensor communication switching method is not suitable for CAN bus-based multi-master communication mechanism. The analog message sending method based on RS485 or CAN bus can achieve local power-off time less than 2 s and remote power-off time less than 20 s. The timing accuracy of the two detection methods can both reach 0.01 s.
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