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Interpretation and application of micro switch
Source: | Author:electronics-101 | Published time: 2014-10-11 | 472 Views | Share:
A micro switch is a quick switch actuated by pressure, also known as a sensitive switch. A master electrical appliance with a small stroke and instantaneous action.

A micro switch is a quick switch actuated by pressure, also known as a sensitive switch. A master electrical appliance with a small stroke and instantaneous action. The micro switch is a small contact switch, and it is turned on with a light touch of the hand. It is often used in the factory for short circuit and overcurrent protection inside the large switch. When the button is operated, the button moves downward, and the spring is stretched by the hook. When the spring is pulled to a certain length, the moving reed moves downward rapidly, and the contact at the right end of the moving reed turns to contact the normally open contact below, thereby realizing the conversion of the circuit. If the external force is removed, under the action of the spring restoring force, the contacts are switched instantaneously again. By adding some rollers or pressing blocks, microswitches of other structural types can be derived, which can be adapted to different purposes. It is widely used in mouse, household appliances, industrial machinery, motorcycles and other places. Although the switch is small, it plays an irreplaceable role.

    The working principle of the micro switch is: the external mechanical force acts on the action reed through the transmission element (press pin, button, lever, roller, etc.) The moving contact and fixed contact at the end are quickly connected or disconnected. When the force on the transmission element is removed, the action reed generates a 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 contact distance of the micro switch is small, the action stroke is short, the pressing power is small, and the on-off is fast. The action speed of the moving contact has nothing to do with the action speed of the transmission element. The micro switch is based on the push pin type, and can be derived from the button short stroke type, the button long stroke type, the button extra large stroke type, the roller button type, the reed roller type, the lever roller type, the short boom type, and the long boom type. etc. Micro switches are used in electronic equipment and other equipment in automatic control and safety protection devices that require frequent switching of circuits. Micro switches are divided into large, medium and small. According to different needs, they can be divided into waterproof type (used in liquid environment) and ordinary type. The switch connects two circuits to provide on-off control for electrical appliances and machines.

    The control of the micro switch is realized by using the throttle wire cam that controls the throttle opening. The micro switch is installed on the appropriate position of the cable cam. When the throttle cable cam returns to its original position, it can withstand the micro switch arm, disconnect the power supply of the electromagnetic coil of the relay, and the relay is disconnected.