Springs are mechanical parts that work flexibly. Parts made of elastic materials are deformed under the action of external forces, and return to their original state after being dismantled by external forces. Usually made of spring steel. The types of springs are complex and varied. According to the shape, there are mainly coil springs, scroll springs, leaf springs, special-shaped springs, etc.
The main functions of the spring are:
1. Control the internal combustion engine valve spring, clutch control spring and other mechanical movements.
2. Absorb vibration and impact energy, such as buffer springs under automobiles and trains, shock absorbing springs in couplings, etc.
3. Use energy as power storage and output, such as clock springs, springs in firearms, etc.
4. Used as a force measuring element, such as a dynamometer, spring in a spring scale, etc. The ratio of spring load to deformation is called spring rate. The greater the stiffness, the stiffer the spring. The springs are made of spring steel. You can determine the stiffness of the spring according to the application. The stiffness depends on the diameter of the wire, the diameter of the spring, the modulus of elasticity of the spring and the spring according to the stress and expansion length.
The spring is deformed under the action of an external force, and after the external force is removed, the spring can return to its original shape. Many tools and equipment use this property of springs to reset. For example, the hinges of many building doors are equipped with return springs that automatically reset when people enter and exit. People also use this feature to make items like automatic umbrellas, mechanical pencils, etc., which is very convenient. In addition, various buttons and buttons are indispensable for return springs.
When we look at various electrical switches, we 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 conducts electricity well. If the contact is poor, the resistance at the contact will increase, and the heat generated when the current passes through will also increase. In severe cases, the metal at the point of contact will melt. The two metal pillars of the bayonet head are equipped with springs and have good contact; As for the central metal piece of the screw cap and all the metal pieces of the socket, their role is to be in close contact to keep them in good condition. There are phosphor bronze springs in the cassette tape, and when the tape is bent and deformed, its elasticity keeps the head in close contact with the tape. There is a long coil spring in the stapler. Its function is to push the staples. On the other hand, when the front staple is rolled out, the rear staple can be sent to the front to be comfortably rolled out, so that the staples can be automatically pushed to the front until all staples are pushed out. Many machines are self-feeding, and the bullets in automatic rifles are self-loaded by the action of springs. In addition, clips such as clothespins, ballpoint pens, and pen covers are clamped to clothes by the pressing action of springs. So, springs are everywhere in our lives.
