First half of 2011 fastener safety hidden event set

Fasteners are key components in the equipment manufacturing industry, ranging from the aerospace industry to the furniture industry. However, there are many types of fasteners, and the models and features are complex. If they are not properly used or installed, the quality cannot be detected in time or if problems arise, it will cause unimaginable consequences. In recent months, there have been frequent occurrences of events that jeopardize human life because of defective fasteners. It is worth thinking deeply about all fastener companies.

Fastener defect events are sorted by time of occurrence and severity:

The escalator accident on the Beijing Metro Line 4 may be caused by two bolts: On July 5, 2011, an upward escalator at the A Station of the Beijing Subway Line 4 Zoo Station suddenly failed. The escalator stopped abruptly and reversed quickly in the upward direction, resulting in the death of one passenger and injury to 30 passengers. The Beijing Municipal Bureau of Quality Supervision said that after the preliminary investigation, the direct cause of the accident was "due to the damage of the fixed parts, the escalator drives the main engine to displace, causing the drive chain to fall off and the escalator to slide."

Problems with Small Screws South Korea's three newest submarines were banned from navigation: In May of the same year, the three latest 214-level (1800-ton) submarines of the Korean Navy were all ordered to be suspended due to hull deficiencies early last year. The reason is that the screws on the deck of the fixed bridge (projecting part above the hull of the submarine) are poor in engagement, and the screws often loosen or break during navigation and can easily cause major accidents.

The Southwest Airlines plane accident was caused by the Boeing Rivets problem: In April of the same year, the 518 American Southwest Airlines carrier 117 passengers were about 34,000 feet above Arizona. The top of the plane suddenly appeared a crack of about 5 feet, and the gap was positive. It is a row of rivets. According to the US Transportation Safety Board, the cause of the accident was a riveting defect. Some of the rivets used to splice the Boeing 737 aircraft's aluminum plate were not properly aligned. Fortunately, no one was injured in the accident.

Chassis fastener defects: In April of the same year, 464 Jeep Wranglers of Chrysler were recalled due to defects in the chassis fasteners. The defect was caused by the fact that the fastening bolts between the front and rear axles and the chassis may have defects in the installation and reduce the vehicle's Steering and handling performance, resulting in a loss of steering when severe.

Hidden Trouble in Fastener Installation: In March of the same year, the Chrysler was not properly installed due to fasteners on the front axle and rear axle joints, which affected the steering of the vehicle and caused noise. This resulted in a car accident. Chrysler announced that it would recall in the United States. More than 10,000 Wranglers.

Rivet head corrosion: In March of the same year, the MG TF sports car, due to the corrosion of the front lower arm rivet head, if it continues to be used, in the extreme conditions, there will be rivets off, resulting in the vehicle can not run normally, there is a safety hazard. Shanghai Automotive recall involved 181 vehicles.

The bolts are not long enough: In February of the same year, the Singlair crib produced by IKEA, the country’s largest household goods manufacturer, had the risk of supporting the mattress not long enough, causing the risk of bed dislocations and eventually children’s oppression and suffocation. For this reason, IKEA is in North America. 26,000 Singlair cribs were recalled.

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