Limiting self-resetting anti-explosion door device of oil field steam-injection boiler

The utility model relates to the technical field of boilers, in particular to a limiting self-resetting anti-explosion door device of an oil field steam-injection boiler, which comprises a cylindricalflue connecting pipe, a cover plate seat and an anti-explosion cover plate, the flue connecting pipe is vertically arranged, an annular cover plate seat is fixedly sleeved outside the upper end of the flue connecting pipe, and the inner wall of the cover plate seat is hermetically connected with the outer wall of the flue connecting pipe. An anti-explosion cover plate used for opening or closingan opening in the upper end of the flue connecting pipe is hinged to the cover plate base through a hinge assembly, the top face of the anti-explosion cover plate can make contact with the limiting plane when the anti-explosion cover plate rotates upwards by a certain angle around the axis of the hinge shaft, and the certain angle ranges from 65 degrees to 75 degrees. The explosion-proof cover plate is reasonable and compa