Visual inspection
View surface integrity
Look carefully at the wall surface of the pressure rod. A normal pressure rod surface should be smooth, with no obvious dents, scratches, cracks, or signs of corrosion. If the surface is found to be damaged, it may affect the strength and tightness of the pressure rod, increasing the safety risk. For example, if there is a small crack, when the pressure of the pressure rod, it may cause the crack to expand, and eventually cause the damage of the pressure rod.
Check the metal parts at the top and bottom of the pressure rod. These parts should be firmly connected and not loose, deformed or falling off. The loosening of the connection part may cause the pressure rod to shake or fall off during use, leading to accidents.
Check the seal
Check the top of the pressure bar for grease seepage. Because the inside of the pressure rod is filled with high pressure gas, if the seal is damaged, the gas leaks, and the lubricating oil may leak out. The appearance of oil stains is an important signal of poor sealing, indicating that there may be a problem with the pressure rod and further inspection is needed.
Second, functional inspection
Lift function test
Sit in an office chair and slowly adjust the pressure bar to raise or lower the seat height. The normal pressure bar should be smooth during the lifting process, without stalling, jumping or sudden sinking. If the lifting process is not smooth, such as feeling a significant change in resistance or “stuck”, it may be that there is a problem in the mechanical structure of the pressure rod, such as piston wear, foreign body entry.
At the same time, pay attention to whether the pressure rod remains vertical during the lifting process. If the pressure bar is skewed, it may be due to a pressure imbalance or mechanical component damage, which also indicates that the pressure bar may be abnormal.
Stress testing (Caution)
It is safe to apply a little extra pressure to test the pressure bar. For example, while sitting in a chair, gently rock from side to side or lean back and forth to feel the support of the pressure bar. A normal pressure bar should provide stable support without excessive shaking or sinking. However, be very careful when performing this test to avoid dangerous situations such as overexerting yourself and causing the chair to tip over.
In addition, if conditions are available, you can let a person with a slightly heavier weight (but within the bearing range of the pressure bar) sit in a chair and observe the reaction of the pressure bar. If the pressure rod sinks abnormally or makes an abnormal sound, it may indicate that there is a problem with the pressure bearing capacity of the pressure rod.
If any abnormal situation is found in the pressure bar during the inspection, in order to ensure safety, it is best to contact a professional office chair maintenance personnel or replace the pressure bar.
Post time: Jan-20-2025