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Carbon Dioxide Expansion Blasting Technique ! Blasting Engineering Method Carbon dioxide blasting began in the 1950s and began to develop in the 1980s in the United States, mainly to avoid explosion accidents caused by explosive blasting flames and specially developed for coal faces in high-gas mines ! Principle : Carbon dioxide gas can be transformed into liquid under a certain high pressure, and the liquid carbon dioxide is compressed into a cylindrical container (blasting cylinder) through a high pressure pump, which is loaded into a safety film, a rupture sheet, a thermal conductivity rod and a sealing ring. Bring the detonator, detonator and power cord to the blasting site, insert the detonator into the drilling hole and fix it, and connect the power supply of the detonator. When the small current passes through the high thermal conductivity rod, the high temperature breakdown safety film will be generated, the liquid carbon dioxide will be vaporized instantly, and the rapid expansion will produce high pressure shock wave and the pressure relief valve will automatically open. The rapid expansion of the volume of liquid carbon dioxide will produce high pressure during the heat absorption gasification, resulting in rock cracking ! Advantage : 1. Gas is safer than explosives, does not belong to civil explosive products, and does not require approval for transportation, storage and use. 2. Without the cumbersome procedures of explosive approval and strict supervision of the public security department. 3. There is no destructive vibration and short wave during blasting, and the proportion of dust is reduced, which has little impact on the surrounding environment. 4. Complex working environment can be used, coal mines and mining fields. 5. Carbon dioxide gas is easy to purchase, and some devices can be reused. 6. Multiple blasting cylinders can be parallel at the same time, the blasting power is large, and the rock individual is large after blasting. Shortcoming : 1. Low efficiency The steps are too cumbersome, can not be fried several times a day, more links have more chances of problems. Such as filling, wiring, sealing and other links. 2. Air surface requirements The use of air surface to have an effect, deep foundation pit or bad air operation surface is not suitable. 3. Low output Can not achieve multiple rows of blasting, resulting in a single blast of the number of cylinders should not be more than two rows, more than a row is easy to jam or blow up the Cylinde r ! 4. High cost the use of the activator is dedicated, disposable supplies, the output is not high, but also cause high cost of blasting. 5. High requirements: the blasting cylinder filling process and site construction are more complex, the quality of the gun hole requirements are higher ! 6. Noise and safety Although the blasting power is not large, after all, the sound is more obvious, if you want to use residential buildings and buildings in the surrounding area, you should try to seek the local safety supervision and environmental protection permission !
