Control Center Function Unit Drawing Interlock Mechanism
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Solution Overview
Problem
Conventional drawing interlock mechanisms in control center function units suffer from angle changes in the rotation cam and transverse deflection of the interlock rod, leading to potential erroneous drawing of the function unit when the circuit breaker is closed, or vice versa, compromising safety.
Innovation Solution
The mechanism incorporates a rotation cam with a first guide for rotational assistance and an interlock rod with a second guide for linear assistance, both sliding along specific edges of metal fittings to stabilize the movement, ensuring consistent engagement with the control center housing and preventing erroneous operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional drawing interlock mechanism is used with a rotation cam and interlock rod, then the circuit breaker can be protected from erroneous drawing, but angle changes in the rotation cam and transverse deflection of the interlock rod may occur leading to safety issues
Solution Approach 1:
A guide groove is introduced as an intermediary element between the rotation cam and interlock rod. The guide groove constrains the interlock rod to move only in the vertical direction, preventing transverse deflection and angle changes. This mediator ensures stable movement while maintaining the drawing interlock function.
Solution Approach 2:
The movement parameters of the interlock rod are changed from free linear movement to constrained vertical movement along the guide groove. This parameter change eliminates transverse deflection and stabilizes the rotation cam's angular position, resolving the reliability-stability contradiction.
2Ease of operation
If the interlock rod is allowed to move freely to engage with the control center housing, then drawing prevention works, but transverse deflection occurs causing engagement position variation
Solution Approach 1:
The guide groove acts as a mediator that guides the interlock rod's movement. It allows the rod to engage with the control center housing while constraining it to move only vertically, ensuring precise engagement position without transverse deflection.
Solution Approach 2:
The movement parameters of the interlock rod are changed from free linear movement to constrained vertical movement along the guide groove. This parameter change eliminates transverse deflection and stabilizes the rotation cam's angular position, resolving the reliability-stability contradiction.
Data Source
Figure 1~2
Figure 3~3B
Figure 4~4B
AI summary
At the time of drawing a function unit having a circuit breaker and the like from a control center housing for repair/replacement, if the circuit breaker is in a closed state, the function unit is prevented from being drawn, and conversely, in a halfway drawn state, the circuit breaker is prevented from being brought into a closed state, thus providing the function unit that enables work with high safety. A rotation cam (6) which performs a rotational movement in conjunction with an opening/closing operation rod (5) for performing switching operation between opening and closing of a circuit breaker and the like, and an interlock rod (10) which performs a linear movement in conjunction with the rotation cam (6), are provided with guides (7, 9) for assisting the respective movements to reduce variations in the movements.