Alarm device for abnormal opening of fan inlet door

The utility model discloses a fan inlet door abnormal opening alarm device which comprises a fan inlet door frame, a fan inlet door is arranged on the fan inlet door frame, a fan control cabinet is arranged on the fan inlet door frame and located above the fan inlet door, a handle frame is arranged on the fan inlet door, and a handle is arranged on the handle frame. The fan inlet door is provided with a pair of lock tongues extending transversely. According to the utility model, the travel switch or the proximity switch is used for detecting the opening/closing state of the fan inlet door and sending out an electric signal, the photoelectric converter is used for converting the received electric signal into an optical signal, and then the optical signal is transmitted to the switch through the reserved optical fiber; the switch remotely transmits an alarm signal to a fan background, the fan video monitoring system realizes an alarm function, or the switch transmits an electric signal of the alarm signal to th