Opening and closing device of protective door

By installing a support mechanism and a power opening and closing mechanism on the protective door, combined with chain drive and a dual-output shaft reducer, the problem of the existing protective door opening and closing device easily reducing the door's lifespan is solved. This achieves more uniform transmission and guidance, and improves the device's service life and adaptability to extreme working conditions.

CN224515014UActive Publication Date: 2026-07-17CHINA RAILWAY CONSTR HEAVY IND
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Patent Information

Application Number
CN202521672031.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-08-07
Publication Date
2026-07-17
Estimated Expiration
2035-08-07

AI Technical Summary

Technical Problem

Existing protective door opening and closing devices can easily reduce the lifespan of the protective door body. Furthermore, existing wheel-type opening and closing devices occupy space, and unilateral overload and vibration transmission lead to a reduction in the lifespan of bearings and shafts, resulting in high maintenance costs.

Method used

The design employs a combination of a support mechanism and a power-operated opening and closing mechanism. The support mechanism is located at one end of the door hinge, while the power-operated opening and closing mechanism is located at the end furthest from the door hinge. It uses chain drive and a dual-output shaft reducer, combined with a convex rail and concave rail guide structure, to achieve uniform transmission and guidance, thereby reducing the force on the door hinge.

Benefits of technology

By combining the support mechanism and the power opening and closing mechanism, the load on the door hinges is reduced, the service life of the protective door is increased, vibration loss and maintenance costs are reduced, and adaptability to extreme working conditions is enhanced.

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Abstract

The utility model relates to the technical field of civil air defense engineering, in particular to an opening and closing device of a protective door, which comprises a supporting mechanism, a first driving mechanism and a second driving mechanism, the first wheel set is mounted on the first wheel carrier in a transferable mode, and the first wheel carrier is used for being mounted on the lower portion of the protective door and located at the end close to a door spindle. The power opening and closing mechanism comprises a second wheel carrier, a second wheel set and a driving assembly; the second wheel set is mounted on the second wheel carrier in a transferable manner, and the second wheel carrier is used for being mounted at the lower part of the protective door and is positioned at one end far away from the door shaft; the driving assembly is installed on the second wheel carrier and is in driving connection with the second wheel carrier. The protective door opening and closing device reduces the bearing force of the door shaft position, and solves the technical problem that the protective door opening and closing device in the prior art is easy to shorten the service life of the protective door body.
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