Travel switch [1], a kind of position switch (also known as limit switch), is a commonly used small current master electrical appliance. Using the collision of the moving parts of the production machinery to make its contact action to realize the switch or break the control circuit, to achieve a certain control purpose. Usually, this type of switch is used to limit the position or stroke of the mechanical movement, so that the moving machine automatically stops according to a certain position or stroke, reverse movement, variable speed movement or automatic round-trip movement.
definition
In the electrical control system, the role of position switch is to realize sequence control, positioning control and position state detection. Used to control the stroke and limit protection of mechanical equipment. Construction: Consists of an operating head, a contact system and a housing.
In actual production, the travel switch is installed in a pre-arranged position, and when the module installed on the moving parts of the production machinery hits the travel switch, the contact of the travel switch acts to realize the circuit switching. Therefore, the stroke switch is an electrical appliance that switches the circuit according to the stroke position of the moving parts, and its principle of action is similar to that of a button.
The stroke switch is widely used in all kinds of machine tools and lifting machinery to control its stroke and protect the terminal limit. In the control circuit of the elevator, the travel switch is also used to control the speed of the car door, the limit of the automatic opening and closing, and the protection of the upper and lower limits of the car.
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