Circuit Breaker Lead Screw Braking Unit
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Solution Overview
Problem
Existing circuit breakers face safety risks and potential damage due to abnormal withdrawing and inserting operations when the carriage is moved while the circuit breaker is in an unstable state, as the current mechanisms do not adequately prevent insertion or withdrawal during closing operations.
Innovation Solution
A device that includes a cradle, a carriage, a girder assembly, and a lead screw, with a braking unit that prevents the lead screw from operating when the girder assembly is released from the cradle, ensuring the carriage cannot be moved unless properly coupled, thus preventing abnormal insertion or withdrawal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the carriage is allowed to move freely during circuit breaker operation, then ease of operation is improved, but safety and reliability deteriorate due to risk of abnormal insertion or withdrawal
Solution Approach 1:
The braking unit is designed to automatically engage and prevent carriage movement before a closing operation can occur. The positioning protrusion and positioning groove mechanism creates a preliminary mechanical constraint that opposes any attempted movement during the critical closing phase, thereby preventing safety accidents before they can happen.
Solution Approach 2:
The braking unit acts as an intermediary mechanism between the carriage movement system and the circuit breaker operation system. It mediates the conflict between ease of movement and safety by selectively allowing movement only when appropriate (when not in closing operation) and blocking movement when necessary (during closing operation), thus resolving the contradiction.
2Reliability
If the braking unit is always engaged to prevent movement, then safety is improved, but ease of operation deteriorates due to inability to perform maintenance and positioning
Solution Approach 1:
The braking unit is designed with dynamic engagement and disengagement capabilities rather than being permanently fixed in one state. The release mechanism allows the braking unit to be dynamically disengaged when maintenance or positioning is required, and re-engaged when safety is needed, thus resolving the contradiction between constant safety and operational flexibility.
Solution Approach 2:
The positioning system is segmented into multiple independent components: the braking unit for safety, the positioning protrusion for precise location, and the release mechanism for operational flexibility. This segmentation allows each component to perform its specific function independently, enabling the system to achieve both safety during operation and ease of positioning during maintenance.
3Productivity
If the lead screw is allowed to operate freely, then productivity is improved through quick positioning, but reliability deteriorates due to risk of operation during unstable states
Solution Approach 1:
The positioning protrusion and positioning groove mechanism provides mechanical feedback that confirms the carriage is in the correct stable position. The braking unit receives feedback from the circuit breaker operation state and automatically engages to prevent lead screw operation when the system is in an unstable closing state, thus ensuring reliability without significantly impacting productivity during normal operations.
Data Source
AI summary
Disclosed is a device for preventing withdrawing and inserting of a circuit breaker. The device for preventing withdrawing and inserting of a circuit breaker include: a lead screw is coupled between a carriage and a girder assembly and rotated by an external force to allow a breaker body to be closed or released while the carriage is moved with respect to a cradle, and a braking unit preventing the lead screw for operating when the girder assembly is released from the cradle. In an unstable state in which the girder assembly is not coupled to the cradle, a withdrawal handle is prevented from being inserted into the girder assembly. Therefore, an abnormal withdrawing operation can be prevented, and thus, various safety accidents, a contact resistance and temperature rise, damage to a device due to electrical breakdown can be prevented.