Circuit Breaker Carriage Interlock Mechanism
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Solution Overview
Problem
Existing circuit breaker apparatuses face issues with severe frictional contact and deformation during repeated operations, leading to defective performance and safety accidents when preventing carriage withdrawal or insertion during closing operations.
Innovation Solution
The apparatus includes a first guiding member coupled with a girder part and a carriage main body, a second guiding member that limits rotational movement, and a constraining unit that prevents movement of the second guiding member during closing operations, using a lead screw, block assembly, push racking plates, and a racking interlock pin to ensure the circuit breaker main body is not withdrawn from the cradle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead screw and nut mechanism is used to control carriage movement, then the carriage can be prevented from unnecessary insertion or withdrawal, but severe frictional contact and deformation occur during repeated operations leading to defective performance
Solution Approach 1:
The lead screw mechanism is segmented into multiple components: lead screw, block assembly, push racking plates, and racking interlock pin. This segmentation distributes the mechanical load across multiple elements, reducing frictional contact and deformation on individual components while maintaining reliable carriage position control during circuit breaker operations.
2Reliability
If clamping members are used to control the nut rotation, then carriage movement can be restricted, but the complex mechanism with multiple link members and manipulation pins causes severe frictional contact and deformation
Solution Approach 1:
The invention extracts and eliminates the complex horizontal moving plate manipulation unit with multiple link members and manipulation pins from the traditional clamping mechanism. Instead, it uses a simplified block assembly that directly interacts with the lead screw and push racking plates, maintaining reliable carriage movement restriction while significantly reducing mechanism complexity and frictional contact points.
3Ease of operation
If the carriage is allowed to move freely during closing operation, then ease of operation is improved, but safety accidents and device damage occur due to unnecessary insertion or withdrawal
Solution Approach 1:
The mechanism dynamically adapts the carriage constraint state based on circuit breaker operation phase. During normal operations, the carriage can move freely for ease of insertion and withdrawal. During closing operations, the racking interlock pin engages with the push racking plates to prevent unnecessary movement, eliminating safety hazards while maintaining operational ease when needed.
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
This solution effectively prevents unnecessary withdrawal or insertion of the carriage during closing, enhancing device stability and safety by minimizing frictional contact and preventing damage, thus avoiding safety accidents and device failure.
Implementation Method 1
A lead screw 130 for adding a rotational force to enable the carriage to move in a forward and backward direction is installed within a casing 31
Implementation Method 2
a nut 33 is threaded with the lead screw in order to provide a moving force to the carriage upon receiving the rotational force of the lead screw 32
Implementation Method 3
a coil spring 45 installed between the manipulation pin 43 and the guide frame 44. In the horizontal moving plate manipulation unit 37, the manipulation pin 43 is protruded upwardly usually by virtue of an elastic force of the coil spring 45
Data Source
AI summary
An apparatus for preventing withdrawing and insertion of a carriage of a circuit breaker is disclosed. When a circuit breaker main body is inserted, an interlocking unit operates by interworking with the carriage withdrawing and inserting preventing apparatus, and while the circuit breaker is being closed, a withdrawal and insertion handle prevents a lead screw from being rotated by the interlocking unit. Thus, when the circuit breaker performs a closing operation, unnecessary withdrawing and inserting operation of the carriage is basically prevented to thus prevent various safety accidents, a contact resistance, a temperature increase, and damage to a device resulting from a breakdown.