One type of travel switch, position switch (also known as limit switch), is a commonly used small current main electric appliance. The collision or control circuit is realized by the collision of the moving parts of the production machinery to make the contact action to achieve a certain control purpose. Typically, such switches are used to limit the position or travel of the mechanical motion, allowing the motion machine to automatically stop, reverse, shift, or automatically reciprocate at a certain position or stroke.
The working principle of the travel switch:
The travel switch is an electric appliance that switches the circuit according to the stroke position of the moving part, because the travel switch is installed in a pre-arranged position, and when the module mounted on the moving part of the production machine hits the travel switch, the contact of the travel switch moves, Realize the switching of the circuit.
The main process is to cut off (or change) the control circuit when the mechanical contact of the travel switch hits the stop, and the machine stops running or changes operation. Due to the inertial motion of the machine, this limit switch has a certain "overtravel" to protect the switch from damage.
The principle of the stroke switch is similar to that of the button. The difference is that one is manual and the other is collided by the collision block of the moving part. When the collision block on the external moving part hits the button to make its contact move, when the moving part leaves, the contact is automatically reset under the action of the spring.
The travel switch is widely used in all kinds of machine tools and lifting machinery to control its travel and limit the terminal. In the control circuit of the elevator, the travel switch is also used to control the speed of the switch car door, the limit of the automatic door opening and closing, and the upper and lower limit protection of the car.
The travel switch can be mounted on a relatively stationary object (such as a fixed frame, a door frame, etc., referred to as a still life) or a moving object (such as a car, a door, etc., referred to as an animal). When the animal approaches the still life, the contact of the switch's linkage drive switch causes the closed contact to break or the open contact to close. The operation of the circuit and mechanism is controlled by the change of the opening and closing state of the switch contacts.
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