Mechanical interlocking device on two flame proof casees that open door in pit

The utility model discloses a mechanical interlocking device on two flame proof casees that open door in pit, solved current screw interlocking device occupation space big with easy to operate's problem not. Include that it keeps apart handle (6) to be provided with the interlocking on right flame proof case box (3) of personally experiencing sth. Part of the body between (9) in the flame proof case left-hand door body (1) and the flame proof case, , the zigzag is provided with on rotating the biconvex rim plate left recess (17) and right recess (18), be provided with on the flame proof case box (3) between the flame proof case left-hand door body (1) and zigzag rotation biconvex rim plate left pin rod support (4), the activity is provided with left step through-hole (5) in left pin rod support (4), the activity cross-under has left pin rod (10) and left pressure spring (11) in left step through-hole (5), fixed be provided with left-wing federation's jam plate (2) on the right flank of the flame proof case left-hand door body (1), the right-hand member activity apical grafting of a left side pin rod (10) is in left recess (17). Occupation space is little, has effectively solved the two interlocking problems of opening the door in little space.