The function of the spring

1. Measuring function: within the elastic limit, the extension (or contraction) of the spring is proportional to the external force. Use the nature of the spring to make a spring balance.

2. Reset function: the spring is deformed under the action of external force, after removing the external force, the spring can be restored to its state. Many tools and equipment use the nature of springs to reset. For example, many building door hinges are equipped with return springs. After people enter and exit, the door will automatically reset. People also use this function to make automatic umbrellas, mechanical pencils and other supplies.

3. Driving function: mechanical clocks, clockwork toys are driven by winding up the spring. When the mainspring is tightened, the mainspring is bent and deformed, storing a certain amount of elastic potential energy. After release, the elastic potential energy is transformed into kinetic energy, which is driven to rotate through the transmission device.

4. Buffer function: Springs are installed between the locomotive frame and the wheels, and the elasticity of the springs is used to slow down the bumps of the vehicle.

5. Sound function: When air flows from the reed hole in the harmonica and accordion, it impacts the reed and the reed vibrates to make a sound.