Springs play different functions in different situations
First, the measurement function
We know that within the elastic limit, the spring's elongation (or compression) is proportional to the external force. The spring balance can be made using springs.
Second, pressing function
Observing a variety of electrical switches will reveal that one of the two contacts of the switch must be spring loaded to ensure that the two contacts are in close contact and that the conduction is good. If the contact is poor, the resistance at the contact increases, and the heat generated when the current passes through will increase, and the metal at the contact will also be melted. The two metal posts on the bayonet lamp holder are also fitted with springs for good contact; as for the central sheet metal of the screw base and the plug metal sheet of all the sockets, they are reeds, and their functions are to ensure close contact between the two sides. Good pass. In the cassette tape, there is a piece of reed made of phosphor bronze, and the magnetic head is brought into close contact with the magnetic tape by utilizing the elastic force generated when it bends and deforms. There is a long spiral spring in the stapler. Its role is to tighten the staples on the one hand, and on the other hand, when the front nail is pushed out, the back nail can be sent to the forefront to prepare for the staples. In this way, one nail can be automatically pushed to the front until all the nails are used up. Many machines automatically feed material, and automatic bullets in automatic rifles rely on this function of the spring. In addition, clips such as clips, clips on ballpoint pens, and pen holders are clamped onto clothes using a spring press.
Third, reset function
The spring is deformed under external force. After the external force is removed, the spring can be restored to its original shape. Many tools and equipment are reset using springs. For example, reset springs are installed on the hinges of many building doors. After people enter and exit, the doors will automatically reset. People have also used this function to make automatic umbrellas, mechanical pencils and other supplies, which are very convenient. In addition, a variety of buttons, buttons and lack of return springs.
Fourth, driving function
Mechanical clocks and clockwork toys are all driven by tight springs. When the spring is tightened, the spring produces a bending deformation and stores a certain amount of elastic potential energy. After release, the elastic potential energy is converted into kinetic energy, and the drive rotates the hour, minute, second hand or wheel. In many toy guns, springs are installed. The springs are compressed to have potential energy. When the trigger is pulled, the springs are released, the potential energy is converted into kinetic energy, and the impact ball is shot along the barrel. The starter guns and military guns used in track and field competitions are also triggered by the use of springs that have been converted from elastic energy to kinetic energy to hit the firing paper or bullets.
Fifth, buffer function
There is a spring between the locomotive, the car frame and the wheel, which uses the elasticity of the spring to slow down the jolt of the vehicle.
Six, vibration sound function
When the air flows from the spring hole in the harmonica and the accordion, the reeds and the reed vibrate to make a sound