Clearly understand the six major functions of springs

1. Measurement function

We know that 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. Squeeze function

Observing various electrical switches, you will find that one of the two contacts of the switch must be equipped with a spring to ensure that the two contacts are in close contact and are in good conduction. If the contact is poor, the resistance at the contact will increase, and the heat generated when the current passes will increase. In severe cases, the metal at the contact will melt. The two metal posts of the bayonet base are equipped with springs for good contact; as for the central metal piece of the screw base and the plug-in metal pieces of all sockets are reeds, their function is to make the two sides in close contact to maintain Same good. In the magnetic tape, there is a piece of phosphor bronze reed, which uses the elastic force generated when it is bent and deformed to make the magnetic head closely contact the tape. There is a long coil spring in the stapler. On the one hand, it is used to tighten the staples. On the other hand, when the front staple is pushed out, the back staples can be sent to the front to prepare the staples to be pushed out comfortably. In this way, the nails can be automatically pushed to the forefront one by one until all the nails are pushed out. Many machines automatically feed materials, and the automatic loading of bullets in automatic rifles relies on this function of springs. In addition, clips such as clothes clips, ballpoint pens, and pen holders are all clamped on clothes by the pressing function of springs.

3. Reset function

The spring deforms under the action of external force. After the external force is removed, 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 make use of this function to make automatic umbrellas, automatic pencils and other supplies, which is very convenient. In addition, various buttons and keys are also indispensable to return springs.

4. Drive function

Mechanical clocks and clockwork toys are driven by winding up the clockwork. 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. In toy guns, starting guns and military guns, they also work with springs.

5. Buffer function

A spring is installed between the frame and the wheel of the locomotive and automobile, and the elasticity of the spring is used to slow down the turbulence of the vehicle.

6. Vibration and sound function

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