The kit spontaneously ignites when the man rides the subway
A few days ago, Liu, an air-conditioning repairer, took the wrong materials for maintenance and put the two chemicals that are prone to spontaneous combustion together, and brought them to the south extension line of Metro Line 1. As a result, when the vehicle was brought to the Heding Bridge Station, the two materials contained in the Tool kit spontaneously ignited and caught fire. Thanks to the timely detection by the subway station staff, the fire extinguisher was quickly extinguished. At present, the Metro Public Security Bureau is investigating the incident and Liu has been detained by criminals.
Around 11:17 yesterday morning, when a subway line approached the Jiangning River near the bridge, an air-conditioning installer, Liu, took out the black smoke inside his carrying tool bag. As a result, an open fire came around and the surrounding passengers were very frightened. Quickly retreat to both sides of the car. Liu himself was also scared and quickly put the tool kit down. While he was trying to extinguish the fire, the train stopped at the Heding Bridge Station. The staff also found out about the emergency situation. He immediately took the fire extinguisher and entered the car and fired the tool kit. Fortunately, the fire was timely and there was no consequence. Subsequently, Liu was taken away by subway police staff for investigation.
More than 4 pm yesterday, the subway police announced the incident on Weibo. “At 11:17 this morning, air-conditioning installer Liu took the reaction with the chemical substances in the kit. He spontaneously ignited on the train to the Heding Bridge Station. The crew immediately fired on the vehicle and evacuated the passengers. The burned area was about half a square. In meters, no one was injured and there was no impact on the operation. Metro police are investigating and handling the parties and reminding everyone not to carry dangerous goods.â€
Yesterday, the reporter learned from various parties that it was discovered that the solids that the worker used to carry air-conditioning for maintenance were originally a mixture of borax and sodium nitrite. These two substances would not burn spontaneously together. On the same day, the worker took the wrong substance. The borax was brought into sulfamic acid. Instead of putting the two substances into the bag, they were mixed in a bag. As a result, sodium nitrite and sulfamic acid chemically reacted and spontaneously ignited, causing a scary incident.
Copyright Notice: This article is reproduced from online media and represents only the author's opinion. It has nothing to do with this site. If news articles and comments infringe your legal rights, please call us and we will handle it in a timely manner.
The masonry bit is a variation of the Twist Drill Bit, the bulk of the tool is a relatively soft steel, and is machined with a mill rather than ground. An insert of tungsten carbide is brazed into the steel to provide the cutting edges.
Masonry bits typically are used with a Hammer Drill, which hammers the bit into the material being drilled as it rotates; the hammering breaks up the masonry at the Drill Bit tip, and the rotating flutes carry away the dust.
Hammer drill bits often use special shank shapes such as the SDS type, which allows the bit to slide within the chuck when hammering, without the whole heavy chuck executing the hammering motion.
Masonry bits of the style shown are commonly available in diameters from 3 mm to 40 mm. For larger diameters, core bits are used. Masonry bits up to 1,000 mm (39 in) long can be used with hand-portable power tools, and are very effective for installing wiring and plumbing in existing buildings.
Hand Tool,Tungsten Carbide Masonry,Premium Carbide Drill,Concrete Drill Bits Set Drill
Behappy Crafts (suzhou)Co.,Ltd , https://www.jshaoyue.com