Jiaozhou Adjustable Office Chair
The main cause of the explosion incident involving adjustable office chairs in Jiaozhou was the serious safety hazard posed by the inferior gas springs inside the chairs. Detailed analysis is as follows:
1. Non-compliant filling gas
Legitimate gas springs should be filled with high-purity inert nitrogen, which has stable chemical properties and can effectively suppress abnormal increases in internal pressure. However, some unscrupulous manufacturers, in order to reduce costs, use high-pressure air or low-purity nitrogen instead. These gases are prone to chemical reactions under high-temperature or friction conditions, leading to a sudden increase in the internal pressure of the gas spring and creating a hidden danger for explosions.
2. Material and workmanship defects
The wall thickness of inferior gas springs is insufficient. After long-term exposure to the mechanical stress generated by repeated lifting and lowering, the walls are prone to cracks or metal fatigue. When the internal pressure exceeds the limit that the wall can withstand, the cracks will rapidly expand, ultimately triggering an explosion. In addition, some manufacturers, in order to cut costs, may use recycled metals or low-strength alloys to manufacture gas springs, further reducing their safety.
3. Catalytic effect of high temperature and friction
During frequent use of the lifting chair, friction between the gas spring and the chair base and piston generates heat. If the filling gas is high-pressure air or low-purity nitrogen, its expansion coefficient is higher when heated, causing the internal pressure to rise rapidly. At the same time, the sealing structure of inferior gas springs may have defects, leading to gas leakage or local pressure concentration, which ultimately triggers an explosion.
4. Direct consequences of the explosion
When a gas spring explodes, the high-pressure gas and metal components inside are ejected at extremely high speeds. For example, in the Jiaozhou incident, the top rod pierced a teenager's abdomen and injured an artery. This was precisely because the impact force of the explosion instantly ejected the metal components of the gas spring, causing fatal injuries.
Prevention recommendations:
When purchasing a lifting chair, choose products that have passed national safety certifications and check whether the gas spring has international certification marks such as SGS and TUV. Avoid frequently adjusting the seat height to reduce mechanical wear on the gas spring. Regularly inspect the appearance of the gas spring. If you find wall dents, air leaks, or lifting and lowering jams, stop using it immediately and replace it.
