Civil air defense is also known as civil defense. Civil defense is an international common word. English CIVIL DEFENCE is an activity of the government to mobilize and organize the masses, take anti-air strikes, disaster relief measures, implement rescue operations, and prevent and mitigate disasters. The civil defense door belongs to the civil defense protection equipment. As the name implies, the human defense door is the door of the people's protection project entrance and exit. The types of civil air defense doors are 1. ordinary single and double protective closed doors and closed doors 2, movable door singles, double protective closed doors and closed doors 3, hose type explosion-proof wave shutters 4, hanging pendulum type explosion-proof wave (shield) valves 5, landing type double-shield protective closed door and closed door 6, connecting port two-way force double-shield protective closed door 7, open double-shield protective closed door in slope, protective fire-proof closed door, fire-proof closed door 9, electric control door . Hunan Jintai Hardware and Machinery Co.,Ltd specializes in producing all kinds of human-proof door copper sleeves, human-proof door skateboards, human-proof door upper and lower hinged copper sleeves, lock sleeves, and human-proof door copper worm gear products, which have been well received by customers for many years.

Upper and lower hinge copper sleeve