简体门及其它清理门都有装有安全自锁装置。
Simplified clean-up doors and other doors are equipped with a safety locking device.
设有多重安全保护装置：超重装置，断链装置，托臂自锁保护，上升过程中的自锁装置。
There are multiple safe protectors: Overweight device, chain fracture device, trailing arm lock protect, device of the lock when it rised.
设有多重安全保护装置：超重装置，断链装置，上升过程中的自锁装置，每个立柱上均有锁止装置。
There are multiple safe protectors: Overweight device, chain fracture device, device of the lock when it rised, there is a lock that stops the device on each post.
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