Withdrawable Arc Eliminator Interlock Mechanism
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Solution Overview
Problem
Conventional withdrawable arc eliminators risk causing arc accidents when moved in a closed state due to the potential for high voltage and ground electrodes to conduct, leading to unsafe conditions during insertion or withdrawal.
Innovation Solution
An interlock device is integrated into the withdrawable arc eliminator, featuring a rotation shaft, links, and a movable pin system that prevents the arc eliminator body from moving when in a closed state by blocking the handle's operation, thus preventing unintended movement and potential arc accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the withdrawable arc eliminator is designed to be movable for insertion and withdrawal, then ease of operation is improved, but the risk of arc accidents increases when moved in a closed state
Solution Approach 1:
The interlock device applies preliminary anti-action by detecting the closed state of the arc eliminator and automatically preventing movement through mechanical blocking. The interlock mechanism is engaged before any movement can occur, counteracting the potential harmful action of moving the arc eliminator while closed.
Solution Approach 2:
The interlock device serves as an intermediary mechanism between the arc eliminator's operational state and its physical movement. It mediates by translating the closed state detection into a mechanical blocking action, preventing direct movement that would cause arc accidents.
2Reliability
If an interlock device is added to prevent movement in closed state, then safety is improved, but device complexity increases
Solution Approach 1:
The interlock device merges multiple functions into a single integrated mechanism: it detects the closed state, generates the blocking action, and physically prevents movement all through one unified structure. This combining of functions reduces the overall complexity compared to having separate systems for each function.
Solution Approach 2:
The interlock device operates self-service by automatically detecting its own operational state and generating the appropriate blocking action without external control. The mechanism uses its own structural configuration to sense when the arc eliminator is closed and automatically engages the interlock, eliminating the need for external sensors or control systems.
Data Source
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AI summary
An interlock device of a withdrawable arc eliminator includes: an arc eliminator body; and a carriage module configured to move the arc eliminator body, wherein the carriage module includes: an insertion and withdrawal screw; a truck moved by the insertion and withdrawal screw; a movable pin installed at part of the truck so as to be moveable up and down; and a movable pin lifter backwardmoved by being pushed by a handle for rotating the insertion and withdrawal screw, and configured to upward-move the movable pin, and wherein the arc eliminator body includes: a housing having a space; an arc extinguisher installed at the housing, and including a moving rod disposed to move to the space back and forth; a fixed body disposed at the space, and having an insertion opening for inserting the movable pin thereinto; an interlock body disposed to be moveable to a first position between the insertion opening and the movable pin, and a second position except for the first position between the insertion opening and the movable pin; and an interlock body moving member operated by interworking with the moving rod, and configured to move the interlock body to the first position or the second position.