Switch Opening/Closing Lever Bolt-Nut Mechanism
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Solution Overview
Problem
The contact of a switch installed in a substation or switching station is difficult to open and close due to the biasing force from a torsion bar, requiring a large-scale operation mechanism for maintenance operations like replacing contacts.
Innovation Solution
A switch design incorporating a tank with a fixed and movable contact, an opening/closing shaft, a jack base, and an opening/closing lever with a bolt and nut mechanism to facilitate easy movement of the movable contact against the torsion bar's biasing force, allowing for manual operation without a large-scale mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torsion bar is used to apply biasing force to the movable contact, then the contact can be maintained in the closed position, but it becomes difficult to move the movable contact against the biasing force during maintenance operations
Solution Approach 1:
The operation mechanism is segmented into modular components: a jack base with penetrating portion, an opening/closing lever with penetrating portion, and a bolt-nut assembly. This segmentation allows the mechanism to be compact while providing sufficient mechanical advantage to overcome the torsion bar's biasing force during maintenance operations.
Solution Approach 2:
The opening/closing lever acts as an intermediary between the operator's manual input and the movable contact. By positioning the lever's penetrating portion through the jack base's penetrating portion, the mechanism transmits and amplifies the applied force, enabling easy movement of the contact against the torsion bar's biasing force without requiring a large-scale mechanism.
2Ease of operation
If a large-scale operation mechanism is provided to move the movable contact against the biasing force, then the contact can be easily operated during maintenance, but the device complexity and space requirements increase
Solution Approach 1:
The opening/closing lever is nested within the tank structure, with its penetrating portion passing through the jack base's penetrating portion. This nesting arrangement allows the operation mechanism to be integrated into the existing switch structure without requiring additional external space, maintaining compactness while providing ease of operation.
Solution Approach 2:
The opening/closing lever is designed to rotate about an axis, transforming rotational motion into linear motion of the movable contact. This dynamic mechanism provides mechanical advantage with a compact structure, eliminating the need for large-scale static mechanisms while maintaining ease of operation during maintenance.
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
Enables easy movement of the movable contact against the torsion bar's biasing force, simplifying maintenance operations and reducing the need for a large-scale operation mechanism, while maintaining space efficiency and cost-effectiveness.
Implementation Method 1
a torsion bar to store a force to rotate the opening/closing shaft so as to move the movable contact in a direction away from the fixed contact
Data Source
AI summary
A switch includes: a tank; a fixed contact and a reciprocally movable contact provided inside the tank; an opening/closing shaft that rotates to thereby move the movable contact; a jack base fixed to the outer side of the tank; a torsion bar that stores a force to rotate the opening/closing shaft so as to move the movable contact in a direction away from the fixed contact; and an opening/closing lever detachably attached to the opening/closing shaft. The jack base has a first penetrating portion formed therethrough and facing the opening/closing lever. The opening/closing lever has a second penetrating portion formed therethrough and facing the jack base. The switch further includes: a bolt inserted through the first penetrating portion and the second penetrating portion; and a nut attached to a portion of the bolt, the portion of the bolt extending out of the first penetrating portion and the second penetrating portion.