Dual-Prevention Lock Device for Screw Safety
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Solution Overview
Problem
Current dual-prevention locks in explosive hazardous areas, such as underground coal mines, fail to reliably prevent unauthorized power transmission and operation due to improper machining of locking openings, posing safety hazards.
Innovation Solution
A dual-prevention lock device with an upper and lower clamping part that securely locks a screw by using a lock core to position the screw between the clamping parts, preventing continuous rotation and ensuring a '0' to '1' switching mechanism, featuring a simple structure design with unequal bolt spacing or thread patterns to prevent unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking opening is machined in the screw as required, then the safety lock can prevent unauthorized power transmission and operation, but workers may fail to machine the locking opening properly in practical installation, resulting in safety lock failure
Solution Approach 1:
The invention extracts the locking function from a separate machining step and integrates it into the screw structure itself through the lock groove. The lock groove is pre-formed on the screw body, eliminating the need for workers to machine a separate locking opening, thus ensuring reliability while simplifying installation operations.
Solution Approach 2:
The lock groove is pre-formed on the screw body during screw manufacturing rather than requiring field machining during installation. This preliminary action ensures the locking feature is always present and properly formed, eliminating installation errors while maintaining simplicity.
2Reliability
If the screw can be rotated continuously for adjustment, then the switch can be positioned flexibly, but the lock cannot reliably prevent unauthorized operation
Solution Approach 1:
The screw thread and lock groove are designed with specific periodic characteristics where the lock groove engages with the lock core at discrete positions. This allows the screw to be rotated for positioning during installation, but once locked, it can only move in discrete steps rather than continuously, ensuring reliable locking while maintaining necessary positioning flexibility.
Solution Approach 2:
The lock groove is positioned asymmetrically on the screw body at a specific angle relative to the screw axis. This asymmetric positioning ensures that when the lock core engages the groove, the screw is locked at a specific orientation, preventing unauthorized rotation while allowing intentional positioning during installation.
3Reliability
If a complex locking mechanism is used to ensure dual-prevention, then unauthorized power transmission and operation can be prevented, but the device structure becomes complicated
Solution Approach 1:
The invention merges the locking mechanism with the screw structure itself. The lock groove is formed directly on the screw body, and the lock core integrates the locking and preventing functions. This combination achieves dual-prevention performance while keeping the overall device structure simple and compact.
Solution Approach 2:
The screw serves multiple functions: it fastens the switch, provides positioning through rotation, and enables locking through the integrated lock groove. The lock core also performs multiple functions by engaging the lock groove to prevent both unauthorized power transmission and operation. This multi-functionality reduces the need for separate components, simplifying the overall device structure.
Data Source
AI summary
A dual-prevention lock device for locking a screw and a method for locking a screw. The dual-prevention lock device comprises: a lower lock body (6); an upper lock body (1) mounted on the lower lock body (6), a receiving space for receiving a screw (3) to be locked being formed between the upper lock body (1) and the lower lock body (6); and a lock core (11) mounted on the lower lock body (6). A lower clamping part extending into the receiving space is disposed on the lower lock body (6), and an upper clamping part extending into the receiving space is disposed on the upper lock body (1). Under the action of a key, the lower clamping part is pushed by the lock core (11), so that the screw (3) to be locked is locked in the receiving space by the lower clamping part and the upper clamping part. With the upper and lower clamping parts for locking the screw, the dual-prevention lock device has a reliable performance and a simple structural design.