Classification of the structure of the travel switch

A type of travel switch, also known as a position switch or limit switch, is widely used in electrical control systems as a small-current main electrical appliance. It functions by using the contact action triggered when the moving parts of machinery collide with it, thereby enabling specific control functions. These switches are commonly used to limit the position or movement of mechanical components, allowing machines to automatically stop, reverse, change direction, or reciprocate at certain positions. In an electrical control system, position switches play a key role in sequential control, position control, and detecting the status of a machine’s position. They help manage the movement and provide protection against over-travel in mechanical equipment. The basic structure of a travel switch includes an operating head, a contact system, and a housing. Travel switches can be categorized into different types based on their design: direct-acting, roller-type, micro-switch type, and combined types. **Direct-acting Travel Switch** The working principle of a direct-acting travel switch is similar to that of a push-button switch, but instead of being manually operated, it is actuated by the collision of a moving part. When the moving part strikes the switch, the contact moves, and when the moving part retreats, the spring inside resets the contact automatically. This type of switch is typically used in applications where the speed of the machine is above 0.4 meters per minute. The speed at which the contacts move depends on the motion of the machine, making it unsuitable for slow-moving systems. **Roller-Type Travel Switch** A roller-type travel switch works by having the armature (or crash block) of the moving machine press against the roller of the switch. This causes the lever to rotate, driving a cam that pushes the switch’s contact to activate quickly. Once the moving machine moves away, the return spring resets the switch. This is known as a single-wheel automatic reset type. In contrast, a two-wheel version does not reset automatically and requires the machine to move back to trigger the reset. These switches are often used in applications requiring precise positioning and have two stable states, providing a sort of "memory" function that simplifies wiring in some cases. **Micro-Switch Type Travel Switch** The micro-switch type travel switch is a compact and highly sensitive device. A common example is the LXW-11 series. Its structure consists of a push rod, spring, moving contact, fixed contact, and a compression spring. When the push rod is activated, it triggers the micro-switch to make or break the circuit quickly. This type is ideal for applications requiring fast response times and high reliability. Overall, travel switches are essential components in industrial automation, ensuring safe and efficient operation of machinery by controlling movement and limiting travel. Their diverse designs allow them to be adapted to various mechanical systems, making them indispensable in modern manufacturing and control environments.

Touch Screen

Touch screen is an electronic display that can detect and respond to the touch of a user's fingers or stylus.  It allows users to interact directly with the display by touching or tapping on the screen, eliminating the need for a physical keyboard or mouse.  Touch screens are commonly used in smartphones, tablets, laptops, and other electronic devices to provide a more intuitive and user-friendly interface.

 

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