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Definition and application of microswitches

Definition and application of microswitches

Source :| Author :electronics-101| Release Time: 2022-05-06|

Microswitch is a pressure actuated fast switch, also known as sensitive switch. A master electrical appliance with a small stroke and instantaneous action. Micro switch is a small contact switch, which is turned on by a gentle touch of the hand, and is commonly used in the factory as a short circuit and overcurrent protection inside the big switch. When the external mechanical force is applied to the operation of the button, the operation button will move down and stretch the spring through the pull hook. When the spring is pulled to a certain length, the moving reed moves rapidly downward, and the contact at the right end of the moving reed turns to contact with the normally open contact below, so as to realize the conversion of the circuit. If the external force is removed, the contact is converted instantaneously under the action of the spring restoring force. With the addition of some rollers or presses, other structural types of microswitches can be derived, which can be adapted to different purposes. Widely used in mice, household appliances, industrial machinery, motorcycles and other places, the switch is small, but plays an irreplaceable role.

The working principle of the micro-switch is that the external mechanical force is applied to the action reed through the transmission element (press the pin, button, lever, roller, etc.), and the energy is accumulated to the critical point, resulting in instantaneous action, so that the moving contact at the end of the action reed is quickly connected or disconnected from the fixed contact. When the force on the transmission element is removed, the action reed produces reverse action force, and when the reverse stroke of the transmission element reaches the action critical point of the reed, the reverse action is completed instantaneously. The microswitch has small contact spacing, short action stroke, small press power and quick on-off. The operating speed of the moving contact has nothing to do with the operating speed of the transmission element. The micro switch takes the pin type as the basic type, and can be derived from the button short stroke type, the button large stroke type, the button large stroke type, the roller button type, the reed roller type, the lever roller type, the short boom type, the long boom type, etc. Microswitches are used in electronic equipment and other equipment for automatic control and safety protection devices that require frequent circuit changes. Micro switch is divided into large, medium, small, according to different needs can be divided into waterproof type (used in a liquid environment) and ordinary type, the switch connects two lines, for electrical appliances, machines and so on to provide power control.

The control of the microswitch is realized by the throttle pull CAM which controls the throttle opening. The microswitch is installed on the appropriate position of the pull wire CAM. When the throttle pull wire CAM returns, hold the microswitch arm, disconnect the relay electromagnetic coil power supply, and the relay is disconnected

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