Electromagnetic Switch Power-Off Key Protection
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Solution Overview
Problem
Conventional electromagnetic switches require deep pressing of the power-off button, which can lead to accidental pressing of the power-on button, causing deformation of the actuating plate and rendering the switch non-functional.
Innovation Solution
A power-off key is introduced between the power-off button and the contact seat, equipped with positioning rods and elastic members that allow immediate separation of movable contacts from immovable contacts when the power-off button is pressed, preventing accidental pressing of the power-on button and maintaining the actuating plate's angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power-off button is pressed deeply to separate the movable contacts from the immovable contacts, then the power supply can be cut off, but the actuating plate may be accidentally pressed and deformed, rendering the switch non-functional
Solution Approach 1:
A power-off key is introduced as an intermediary component between the power-off button and the contact seat. When the power-off button is pressed, the power-off key transmits the force to directly push the elastic seat and separate the movable contacts from the immovable contacts, preventing accidental pressing of the actuating plate while ensuring reliable power cutoff
Solution Approach 2:
The contact seat is divided into separate functional components: the elastic seat holding the movable contacts is separated from the main contact seat body. This segmentation allows the elastic seat to be directly pushed by the power-off key without moving the entire contact seat or actuating plate, enabling safe power cutoff
2Reliability
If the power-off button is pressed deeply to ensure complete separation of contacts, then power cutoff is achieved, but the operation complexity increases and accidental pressing risk rises
Solution Approach 1:
The power-off key acts as a mediator that translates the button pressing motion into direct action on the elastic seat. This intermediary mechanism ensures complete contact separation with a normal button press stroke, eliminating the need for deep pressing while maintaining reliability
Solution Approach 2:
The power-off key is pre-positioned to engage with the elastic seat before button pressing begins. When the button is pressed, the force is immediately transmitted to separate the contacts, ensuring reliable power cutoff without requiring the user to press the button deeply or with excessive force
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 design allows for immediate power cutoff without deforming the actuating plate, ensuring the electromagnetic switch remains functional and reducing the risk of damage during emergency shutdowns.
Implementation Method 1
Elastic members 15 are provided between the press assembly 14 and the accommodation troughs 134 of the contact holder 131, respectively. When the contact seat 131 is biased by the elastic members 15 to move downward, the movable contacts 136 of the elastic seat 135 are separated from the immovable contacts 137.
Implementation Method 2
The electromagnetic assembly 12 includes a coil holder 121 and an actuating plate 122. The actuating plate 122 is pivotally mounted on the coil holder 121, and is formed with an interlocking end 123 and a magnetic end 124. The magnetic end 124 is located on the coil holder 121.
Implementation Method 3
The electromagnetic assembly 12 includes a coil holder 121 and an actuating plate 122. When the power-on button 141 is pressed and then the magnetic end 124 of the actuating plate 122 is pushed downward, so that the interlocking end 123 is tilted to drive the contact seat 131 to move upward
Data Source
AI summary
An electromagnetic switch protection structure includes a power-off key located between a press assembly and a contact seat. The power-off key is provided with a press portion extending downward. The press portion directly presses an elastic seat of the electromagnetic switch. When a power-off button is pressed, movable contacts of the elastic seat can be immediately separated from immovable contacts of electrode plates to cut off the power supply of the electromagnetic switch. That is, the press assembly is slightly touched to cut off the power supply, not pressing deep to cause an erroneous pressing, to avoid damage to the electromagnetic switch, achieving the protection of the electromagnetic switch.