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为了方便安装及检修,铁路客车端部平顶板需要设置活门。活门安装方式通常为折页和锁。为防止在车辆装配或运行过程中发生意外,需要在活门上设置安全装置,防止活门意外脱落的情况发生。现有技术多采用安全绳的形式达到此目的。
In order to facilitate the installation and maintenance, railway passenger car roof flat roof needs to be set. Valve installation is usually folding and locking. In order to prevent accidents during assembly or operation of the vehicle, a safety device needs to be installed on the valve to prevent the valve from accidentally falling off. The prior art mostly adopts the form of safety rope to achieve this purpose.