Screw-Driven Door Locking Mechanism with Guide Locking Piece
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Solution Overview
Problem
Existing screw-driven control systems for doors, relying on electromagnetic or mechanical locks, face issues of automatic unlocking when the electromagnetic lock de-energizes, and have complex structures leading to reliability and safety concerns, especially in public transportation.
Innovation Solution
A screw-driven control system incorporating a driving mechanism with a guide locking piece and limiting mechanism, where a screw rod and nut assembly reciprocate to lock and unlock, using a torsion spring for stability and a compact design with a reduced number of components to minimize weight and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electromagnetic lock is used to lock the door, then the locking function is achieved, but the door automatically unlocks when the electromagnetic lock is de-energized
Solution Approach 1:
The locking function is divided into two independent parts: an electromagnetic lock for initial locking and a mechanical lock for secure retention. The mechanical lock consists of a locking piece with a locking end and a limiting mechanism, separating the electromagnetic actuation from the mechanical retention function to eliminate the automatic unlocking risk.
Solution Approach 2:
A follow-up member acts as an intermediary between the electromagnetic lock and the mechanical lock. When the electromagnetic lock moves, it drives the follow-up member which then engages the locking piece. This intermediary transfers the electromagnetic motion to the mechanical locking system, ensuring the door remains locked even when electromagnetic power is removed.
2Reliability
If a mechanical lock structure is used to lock the door, then the door remains locked when de-energized, but the structure becomes complicated with more components
Solution Approach 1:
The electromagnetic lock and mechanical lock are merged into a single integrated system. The locking piece has both an electromagnetic component and a mechanical locking component unified in one structure. The follow-up member connects both systems, allowing them to work together as a coordinated unit rather than separate mechanisms, thereby reducing overall complexity.
Solution Approach 2:
The locking piece serves multiple functions: it acts as both the electromagnetic actuator and the mechanical locking element. The limiting mechanism provides both motion guidance and locking engagement. This multi-functionality reduces the number of separate components needed compared to traditional systems with distinct electromagnetic and mechanical locking mechanisms.
3Reliability
If a traditional mechanical lock system is used, then the door can be securely locked, but the dead weight increases
Solution Approach 1:
Complex and heavy components from traditional mechanical lock systems are extracted and replaced with a simplified mechanism. The locking piece and follow-up member use a compact design that eliminates unnecessary mechanical linkages, reducing the overall weight while maintaining secure locking functionality.
Solution Approach 2:
The design changes the dimensional parameters of the locking components to optimize the weight-strength ratio. The locking piece and limiting mechanism are sized and shaped to provide sufficient mechanical strength for secure locking while minimizing material usage and overall weight compared to conventional mechanical lock systems.
4Reliability
If a complex mechanical lock structure is used, then the locking function is achieved, but the control difficulty increases
Solution Approach 1:
The limiting mechanism provides mechanical feedback by physically limiting the motion range of the locking piece. When the locking piece reaches the locked position, the limiting mechanism prevents further movement, providing automatic position confirmation. This mechanical feedback simplifies control by eliminating the need for complex sensors or control algorithms to detect locking status.
Solution Approach 2:
The locking system is self-regulating through the limiting mechanism that automatically prevents over-travel and ensures proper engagement. The follow-up member automatically engages the locking piece when the electromagnetic lock actuates, and the limiting mechanism automatically prevents disengagement unless properly commanded, reducing the need for complex external control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures secure locking and unlocking without relying on continuous power, reduces weight and complexity, enhancing safety and reliability, and simplifies manufacturing and installation.
Implementation Method 1
a screw rod and a nut assembly driven by a motor; the nut assembly comprises a transmission frame, a nut sleeved in the screw rod, and a follow-up member fixed in the nut; the nut is mounted in the transmission frame, and the transmission frame is connected with a controlled object; the screw rod drives the nut assembly to reciprocate axially along the screw rod
Implementation Method 2
using a torsion spring for stability
Data Source
AI summary
A screw-driven control system includes a driving mechanism fixed in a cross beam, a guide locking piece and a limiting mechanism. The driving mechanism includes a screw rod and a motor driven nut assembly having a transmission frame, a nut sleeved in the screw rod, and a follow-up member fixed in the nut; the nut is mounted in the transmission frame, and the transmission frame is connected with a controlled object; the screw rod drives the nut assembly to reciprocate axially along the screw rod.