During the Cultural Revolution, Zhang Wentian and his wife visited their relatives in the "airplane room" of Sun Yat-sen University in Guangzhou. They were picked up by a car imported by Guangdong Provincial Party Committee, accompanied by the chef of Zhang Wentian and his wife (this chef has never seen a bench in the south, and the width is 138 mm, and the chef sits on it). At that time, that is, more than 30 years ago, imported cars used the pneumatic energy storage spring at the back door of the car as a counterweight to open and close the booster. Now the cupboard door also uses this device.

The sealing performance of the cylinder is extremely high, the metal material is better, the rubber material is better, and the machining accuracy is higher. In recent ten years, South Korea and Taiwan Province Province have also started production, usually filled with high-density nitrogen to delay the leakage, which is similar to the high-density nitrogen of automobile tires, and the high-density nitrogen of automobile tires can also improve the dynamic stability.

The air pressure energy storage spring with poor quality leaks quickly, and very few will explode naturally. In the material recovery department, the pneumatic energy storage spring and motorcycle shock absorber should be disassembled for decompression, otherwise they will become bombs in the steelmaking furnace!

The performance of pneumatic energy storage spring fully reflects the material level, processing equipment level and hydraulic device level, and whether it can be localized reflects the real strength of a country's military industry.