Nitrogen springs are widely used in modern mechanical equipment, but due to insufficient understanding of their characteristics, users often encounter various problems during use. This article will summarize the common errors in the use of nitrogen springs and their solutions to help users better apply and maintain nitrogen springs and improve the reliability and safety of equipment.
1. Conditions for use of nitrogen springs
Temperature: The normal operating temperature is -20℃～+60℃. Too high or too low temperature may cause nitrogen spring failure and leakage. In addition, the ambient temperature affects the size of the reaction force of the nitrogen spring. The higher the temperature, the greater the reaction force.
Use environment taboos:
- Dust-the piston rod is prone to adhesion and damage to the sealing structure during movement, resulting in leakage. If it needs to be used in a dusty environment, it is recommended to add a dust cover.
- Corrosion-the piston rod is corroded, and the sealing performance with the internal sealing structure is affected, resulting in leakage and failure.
- Spraying - Do not spray the piston rod, or stain it with paint or other sticky substances. During the extension and retraction of the piston rod, the sprayed substances pass through the sealing structure, destroying the sealing and causing leakage and failure.
2. Avoid scratches on the cylinder and piston rod
The nitrogen spring achieves the sealing effect through the cooperation of the internal sealing structure and the piston rod surface. During the installation and use process, the piston rod should be prevented from collision, extrusion, scratches or abrasions, adhesives, winding, rust and other piston rod surface abnormalities, otherwise it will lead to sealing damage, causing leakage, failure, etc.
3. Nitrogen springs cannot be subjected to lateral force
Note: Nitrogen springs subjected to lateral force may cause bending of the piston rod and deformation of the internal sealing structure, thereby causing failure abnormalities such as jamming, jamming, and leakage.
4. Nitrogen springs cannot be used beyond the stroke
When selecting nitrogen springs, it is recommended to reserve 5-10 mm stroke (if 70 mm stroke is required, it is recommended to select 80 mm and above stroke specifications). Due to the position of the nitrogen spring joint, there is paint protection at the welding position or joint structure.
Collision and contact with the sealing structure during the expansion and contraction process may cause leakage failure.
5. The joints and fixed brackets at both ends of the nitrogen spring cannot be locked and must be kept in a relatively rotatable state
During the use of the nitrogen spring, there will be relative rotation between the joint and the fixed point of the equipment. If the relative rotation effect is not achieved during installation, the joint may break.
6. Avoid deflection of the fixed head during nitrogen installation
During installation, ensure that the moving surface of the nitrogen spring is in the same plane with the installation points at both ends, and the relative rotation plane of the joint is in the same plane with the actual moving plane of the nitrogen spring. Avoid tilting and deflection, otherwise the nitrogen spring will be subjected to lateral force (see point 4 for details), nitrogen leakage, or joint breakage.
7. Install the nitrogen spring piston rod downward
The piston rod is installed downward, which can ensure the lubrication of the internal oil, protect the sealing ring, and provide a buffering effect.
If it is installed and used upward for a long time, the sealing ring and the piston rod will rub dry for a long time, which may cause leakage and failure.
8. The wrong installation direction causes the door to open automatically or close too quickly without buffering
During the installation design, attention should be paid to the direction of the nitrogen spring reaction force during the closing process. There is no force in the direction of opening the door after closing the door, and the reaction force always has a supporting force on the door during the closing process. Otherwise, it is easy to cause the door to be bounced open again after closing the door or the closing speed is suddenly too fast during the closing process.
9. Improper selection of nitrogen spring length or stroke
During the design and installation process, the situation that the door cannot be completely closed due to too short stroke or too long length should be considered.
Through the above measures, users can effectively avoid common errors in the use of nitrogen springs, extend their service life, and improve the reliability and safety of the equipment. Correct use and maintenance can not only ensure the normal operation of the equipment, but also save maintenance costs and time for enterprises.
