Utilize the function of spring

Spring measurement function
We know that within the limits of elasticity, the extension (or contraction) of extension springs, compression springs, torsion springs, bending springs, springs, and coil springs is proportional to the external force. Use the nature of the spring to make a spring balance.
Spring compression 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 a 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 pushed to the front automatically one by one until all the nails are pushed out. Many machines feed automatically, and the automatic loading of bullets in automatic rifles relies on this function of springs. In addition, clips like clothes clips, ball-point pens, and pen holders are clamped on clothes by the pressing function of springs.
Spring return function
The spring is deformed under the action of external force, and after the external force is removed, the spring can be restored to its state. Many tools and equipment use 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, automatic pencils and other supplies, which is very convenient. In addition, various buttons and keys are also indispensable for return springs.
Spring 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 by the transmission device. In toy guns, starting guns and military guns, they also work with springs.
Spring buffer function
A spring is installed between the vehicle frame and the wheel, and the elasticity of the spring is used to slow down the bumps of the vehicle.
Spring vibration 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.