液压系统的设计避免了在举升过程中后板自动回落，机械式自动锁紧装置提高了机构可靠性。
The design of this hydraulic system avoids automatic dropping of backboard in the process of lifting, and the mechanical device of automatic lock system improved reliability of mechanism.
结果表明，该装置具有结构紧凑，质量轻，动作灵敏、迅速，锁紧安全可靠等优越的技术性能。
This safety device provided with features of compact structure, light weight, motion agility, safe and reliable operation had been verified by example.
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