Circuit Breaker Counting Device Indirect Drive Mechanism
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Solution Overview
Problem
Existing circuit breaker counting devices inaccurately record operation times due to direct mechanical connections that cause shaking, leading to instability and reduced reliability.
Innovation Solution
A circuit breaker with a counting device featuring a counter, executing lever, and linkage rotating shaft, where the executing lever is connected to a counting lever through a connecting rod and reset spring, allowing for indirect rotation and reducing the impact of shaking, enabling accurate and stable counting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cam with V-shaped groove rotating shaft is adopted to directly drive a counter lever, then the structure is simple, but the counting accuracy deteriorates and device stability worsens due to shaking during circuit breaker operation
Solution Approach 1:
The patent introduces an intermediary mechanism consisting of a cam follower, connecting rod, and lever system between the cam rotating shaft and the counter lever. The cam follower converts the cam's rotational motion into linear motion, which is then transmitted through the connecting rod and lever to drive the counter. This intermediary mechanism isolates the counter from direct exposure to cam shaking, filtering out vibrations while preserving the counting function.
Solution Approach 2:
The patent divides the direct drive connection into multiple segmented components: cam rotating shaft, cam follower, connecting rod, lever, and counter lever. Each component performs a specific function in the motion transmission chain. This segmentation allows each component to be optimized for its specific function while reducing the transmission of harmful vibrations to the counter.
2Device complexity
If direct mechanical connection is used between cam and counter lever, then the device complexity is reduced, but the stability deteriorates due to shaking causing transmission structure failure
Solution Approach 1:
The cam follower acts as a mediator that converts rotational motion to linear motion while isolating the counter lever from direct cam vibrations. The connecting rod and lever system further mediate the motion transmission, creating a buffered connection that reduces the impact of shaking on the overall transmission structure stability.
Solution Approach 2:
The mechanism design incorporates inherent cushioning through the cam follower's contact with the cam surface and the lever system's mechanical advantage. These elements absorb and dampen vibrations before they can propagate through the transmission structure, providing beforehand protection against shaking-induced failures.
3Device complexity
If cam directly drives counter lever, then the device structure is simplified, but measurement precision deteriorates because only rotation revolutions can be recorded, not operation times
Solution Approach 1:
The cam follower and connecting rod mechanism serve as intermediaries that translate the cam's rotational cycles into precise linear displacements of the counter lever. Each complete rotation of the cam produces a specific, repeatable motion pattern in the counter lever, enabling accurate counting of operation times rather than just rotation revolutions.
Solution Approach 2:
The patent changes the motion parameter transmission from direct rotational coupling to a converted linear-rotational mechanism. The cam follower converts rotation to linear motion, which is then converted back to rotation by the lever system, with each conversion stage providing opportunities for precise parameter control and accurate operation time measurement.
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 solution enables direct recording of operation cycles with improved stability and extended service life by reducing the influence of shaking on the counting mechanism.
Implementation Method 1
a reset spring 5 which can provide the rotation restoring force for the executing lever 4 is provided on the executing lever 4
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A counting device of a circuit breaker comprises a counter and an executing lever. The counter is fixedly mounted on one side of an operation mechanism of the circuit breaker, the executing lever is mounted on one side of the operation mechanism in a pivotal mode and is in driving connection with a counting lever of the counter and a linkage rotating shaft extending out from the operation mechanism, and a reset spring which can provide the rotation restoring force for the executing lever is provided on the executing lever. One end of the executing lever is in driving connection with the counting lever through a connecting rod, and the other end of the executing lever is in sliding contact with a cantilever extending out from the end portion of the linkage rotating shaft. One end of the connecting rod is connected with the executing lever, and the other end of the connecting rod is connected with the counting lever. The cantilever can be driven to rotate through the operation mechanism and drives the executing lever to rotate to enable the connecting rod to move so as to pull the counting lever to complete counting. The counting device of the circuit breaker is accurate in counting, stable in device and simple in structure.