 Optical grating
The performance of protection and safety is improved, and the planar protection reduces the probability of generating accidents and increases the reliability of door | 
Air chamber
Contact type protection,
give the signal after receiving pressure, which makes the rebound rise in order to guarantee the safety of personnel / goods / vehicle
| 
Torsional spring
The patent of balance torsional spring can improve the service life of driving and guarantee the high-speed startup |
