Development Of Magnetic Detonator Detector

Detonator, as common materials to trigger explosive device, is an indispensable factor inexplosion engineering. Along with the development of electrical and electronic engineering,new types of blasting caps are evolving with more secure and stable characteristics.Magnetic detonator is among the most typical ones. Due to the particularity of explosivedevice industry, the primary problem for producers is quality assurance. Since theresistance of bridgewire of magnetoelectric blasting cap is pretty small (approximately1),the quality inspection normally used through manufacturing line is only be able to detectthe open circuit fault. Disability in distinguish the short circuit and qualified productscaused entering of nonconforming products into the market, resulting in hidden risks ofexplosion engineering.This paper designed a Magnetic detonator quality evaluation system according torequirements raised by some domestic manufacturer. Taking as many demands frommanufacturing line as possible into consideration, it can clearly divide the open circuit,short circuit and qualified state of caps. In addition, It connects PC to analyze the detectiondata statistically from every manufacturing line. Comparing to the former evaluationsystems, it has dramatic superiority to detect problems of the products and can be utilizedas a revised generation of detection devices.The Magnetic detonator quality evaluation system designed in this paper mainly consistsof two parts. One is hardware composition of detection and another is the upper monitor PC.The hardware includes the center control module-the MCU STM32F103RBT6withCortex_M3core, the power source module, signal generator module and the staterecognition module. The power source takes the storage battery for power supplying,enabling the continuous working time up to72hours. The signal generator produces adriving signal of10KHz, which finely fits the detection requests and would not bring asecond damage to the cap. The state recognition circuit is responsible for obtaining thedetection results. The center control module dominates the release of driving signal, the receipt of detection results and the controlling of warning sounds and light. The qualityevaluation system can be custom made. The detection results display can be indicated byLEDs, ancillary LCD, or controlled by the upper monitor PC. The upper monitor softwareon PC is developed based on MFC. It is able to control a single evaluation system and canadapt to detection of various types of Magnetic detonator by changing the parameter. In thedesign, a communication protocol similar to Modbus is established, achieving the networkbuilding of evaluation systems from multiple manufacturing lines to analyze data.The paper has four chapters. Chapter1introduces the research background and currentsituation. Chapter2illustrates the specific implementation of hardware and software of theevaluation system, including the designs for each modules. Chapter3represents the testingresults. And Chapter4summarizes the existing problems of the evaluation system.