The invention provides an automatic
crawling ladder device used for coming in / out of an
elevator pit. The automatic
crawling ladder device has an opened state and a
closed state relative to an
elevator wall. The automatic
crawling ladder device comprises a crawling ladder body, a connecting mechanism and a locking device, and further comprises a pull rod, a spring A and a spring B, wherein the connecting mechanism is used for connecting the crawling ladder body with a well
enclosure in a rotating mode, the locking device is used for locking the crawling ladder body in the
closed state, the pull rod is connected with the crawling ladder body in a sliding mode, the spring A and the spring B are in a stretched state, the other end of the pull rod is connected to the wall
enclosure in a rotating mode, the two ends of the spring A are fixed on the crawling ladder body and the wall
enclosure respectively, and the two ends of the spring B are fixed on the pull rod and the wall enclosure respectively.
Detector switches are installed at the two ends of the crawling ladder body and connected with a control mechanism of an
elevator. The two
detector switches are used for determining whether the crawling ladder body is completely opened or closed so as to guarantee the
safe operation and stopping of the elevator. The automatic crawling ladder device is arranged below a
base station hoistway door sill and can be folded and closely attached to the wall enclosure when the crawling ladder body is in a non-work state, and therefore spaces is saved; when the crawling ladder body is in the opened state, the automatic crawling ladder device can be stably fixed in a well.