Principle and function of travel limit switch

• time：2023-08-12 16:25:36
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The principle of the limit switch is based on mechanical contact or non-contact sensor technology. It is used to detect the position, motion state or specific events of objects and convert this information into electrical signals to control the operation or triggering of the equipment. Other related operations. The following is the principle and function of the travel limit switch:

Proximity sensor

Principle:

Mechanical contact limit switch: This type of limit switch usually contains a touchable mechanical device, such as a contact or button. When the object reaches the set position, it will touch the mechanical device, and the contact generated by the mechanical movement will close or open the circuit of the switch, thus generating a corresponding electrical signal.

Non-contact limit switch: This type of limit switch does not require direct physical contact. They use some sensing technologies, such as photoelectricity, magnetoelectricity, ultrasonic waves, etc., to sense the position or status of objects. When an object approaches the limit switch, it triggers the sensor and generates an electrical signal.

Function:

Position detection: The travel limit switch is used to detect whether the equipment or object reaches the predetermined position. When the object reaches a specific position, the state of the switch changes, and the position can be confirmed through this signal.

Safety protection: Limit switches are used to ensure that the equipment does not exceed the safe range during operation to avoid equipment damage or danger. For example, the limit switch in the automatic door system can detect the opening and closing status of the door to ensure that the door is in a safe position.

Motion control: In automation systems, travel limit switches can be used to control the movement of equipment. When the equipment reaches a specific position or specific motion state, the switch signal can trigger the corresponding control action.

Automated control: The travel limit switch can be integrated with the control system to realize automatic switching, stopping or other control actions. This is very important for automating processes.

In short, the travel limit switch realizes functions such as position detection, safety protection, motion control and automation control by detecting position and status. It is an indispensable sensor device in the industrial and manufacturing fields.