Rust-proof mechanism for mining hydraulic support pin shaft

The invention provides a rust-proof mechanism for a mining hydraulic support pin shaft. The rust-proof mechanism comprises a base, a ratchet mechanism and a connecting rod, wherein the ratchet mechanism comprises a ratchet pin shaft and a pawl, the base is hinged to the connecting rod through the ratchet pin shaft, and the pawl is connected to a main rib of the connecting rod; through the use of the ratchet mechanism, when a hydraulic support ascends, the connecting rod and the ratchet pin shaft can rotate relative to each other, and when the hydraulic support descends, the base and the ratchet pin shaft can rotate relative to each other. The rust-proof mechanism has the beneficial effects that the ratchet pin shaft can move relative to the support or the base in the ascending process and the descending process, so that the situation that the pin shaft is rusted and difficult to take out due to long-time relative rest is avoided, meanwhile, the effect of preventing the pin shaft from being rusted is achieved