The structural characteristics of the button switch
The structure of the button switch: It is composed of a button cap, a return spring, a fixed contact, a movable contact, a shell and a pillar connecting rod.
Normally open contact (moving contact): refers to the contact in the original state (the electrical appliance is not subjected to external force or the coil is not energized), the fixed contact and the movable contact are in a separate state.
Normally closed contact (moving break contact): refers to the contact in the original state (the electrical appliance is not subjected to external force or the coil is not energized), the fixed contact and the movable contact are in a closed state.
Normally open (moving on) button switch, when not pressed, the contact is open, when pressed, the contact is closed and connected; when released, the button switch is reset and opened under the action of the return spring. In the control circuit, the normally open button is often used to start the motor, also known as the start button.
The normally closed (moving off) button switch is the opposite of the normally open button switch. When it is not pressed, the contact is closed, and the contact is opened when pressed; when the hand is released, the button switch is reset and closed under the action of the reset spring . The normally closed button is often used to control the parking of the motor and is also called the parking button.
Compound button switch: a button switch that combines a normally open and a normally closed button switch, that is, it has a normally closed contact and a normally open contact. When not pressed, the normally closed contact is closed, and the normally open contact is open. When the button is pressed, the normally closed contact is opened first, and the normally open contact is closed; when released, the button switch will first open the normally open contact and then close the normally closed contact under the action of the return spring , The compound button is used in the interlock control circuit.
(1) According to different use occasions and specific purposes: Select the type of metal push button switches according to the use occasion, such as open type, protective type, waterproof type, anti-corrosion type, etc.; select the appropriate form according to the use, such as handle rotating type, key type, etc. type, emergency type, lighted type, etc. For example, […]
In the proximity switch, there is a component that has the ability to “perceive” the object approaching it, that is, the displacement sensor. It can use the sensitivity of the displacement sensor to the approaching object to achieve the purpose of controlling the switch on or off. The object moves from the switch to the […]
There are many types of button switches, including ordinary button type, mushroom head type, self-locking type, self resetting type, rotary handle type, indicator type, symbol type with light and key type. There are single button, double button, I button and different combination forms. Generally, it adopts ponding structure, which is composed of button cap, return spring, […]
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