Sealing cover thread detection device

The utility model discloses a thread detection device for a sealing cover. The thread detection device comprises a base, a detection rod and a reset spring, the detection rod penetrates through the base, and the two ends of the detection rod extend outwards; an accommodating hole is formed in the lower end of the base; a baffle plate is fixed on the detection rod in the accommodating hole; the reset spring sleeves the detection rod in the accommodating hole, the upper end of the reset spring is fixedly connected with the base, and the lower end of the reset spring is fixedly connected with the separation blade; scales are arranged at one end, away from the accommodating hole, of the detection rod; the lower end of the base is fixedly provided with a circular truncated cone of which the diameter is gradually reduced from top to bottom, and the detection rod downwards penetrates out of the circular truncated cone; a tip part is arranged at the lower end of the detection rod; the lower end of the round table abu